SAT reading: how to choose the answer the passage actually supports
Many SAT reading questions ask which choice is best supported by the passage. The right answer is rarely a surprise. Wrong answers are usually tempting because they sound reasonable or smart. What they do is say more than the text says. This guide shows the ways an option can overreach and how to check every choice against the exact words of the passage.
What “supported” asks for
A supported choice is one you can point to in the passage: the same claim, at the same strength, about the same thing. It does not need to repeat the passage word for word, but you should be able to say which sentence backs it up. Your own opinions and outside knowledge do not count, even when they are true.
Four ways an option overreaches
- Too strong. Words like always, never, all, only, proves or the main reason claim more than a limited result can show.
- Cause without evidence. The passage reports that two things happened together or in order, and the choice says one caused the other.
- Wrong scope. The choice is about a bigger group, a longer time or a different topic than the passage covers.
- Reversal or outside idea. The choice contradicts a detail, or adds a fact the passage never mentions.
Worked example 1
A town library extended its Saturday opening from four hours to eight hours in 2022. Over the next year, weekend visits rose from about 300 to about 450 a month. The head librarian noted that a nearby school had also begun assigning weekend research projects that year. She said the figures could not separate the effect of the longer hours from the effect of the school’s new assignments.
Which choice is best supported by the passage?
- The longer Saturday hours caused the rise in weekend visits.
- Weekend visits rose after the hours were extended, but another change could also explain the rise.
- The school’s assignments were the main reason for the rise.
- Other libraries should extend their weekend hours.
Show the answer and why
B. It matches both facts: visits rose after the change, and the librarian said the figures could not separate the two explanations.
A is a cause claim the librarian says the data cannot support. C makes the same mistake in the other direction. D is outside the passage, which says nothing about other libraries.
Worked example 2
Researchers measured nitrate in 15 streams before and after planting trees along the banks. Nitrate levels fell in 12 of the 15 streams.
Which choice is best supported?
- Planting trees along banks always lowers nitrate.
- Nitrate fell in most of the sampled streams after the trees were planted.
- Tree planting is the cheapest way to lower nitrate.
- Nitrate fell in every sampled stream.
Show the answer and why
B. Twelve of 15 is most of the streams. A (“always”) goes beyond 15 streams. C brings in cost, which the passage does not mention. D contradicts the 12 of 15.
A routine that works under time
- Read the question stem, then the passage, and put the passage’s main claim in your own words.
- For each option, find the sentence that backs it up. If you cannot, cross it out.
- Circle strength words in the option and compare them with hedges in the passage such as some, about, may or could not separate.
- Between two survivors, pick the one that claims less and is still fully backed by the text.
This is a habit for checking answers, not a trick: a strong word is not automatically wrong if the passage really is that strong. The test is always the text.