SAT Reading & Writing · Information and Ideas
Inferences
One of four domains on every Digital SAT Reading & Writing section, worth roughly a quarter of the score.
The rule
Pick the choice that must be true based only on what the text says. The right answer directly restates a causal chain, a stated finding, or a logical consequence shown in the passage. Never rely on outside knowledge or what feels plausible. If the text gives one specific relationship, the inference follows that relationship exactly — never reverses or expands it.
Worked example
It can most reasonably be inferred from the text that the finding about the microorganism community composition was important for which reason?
- A.
It provided preliminary evidence that microorganism-mediated nutrient cycling was accelerated in the transplanted cores.
- B.
It suggested that temperature-induced changes in microorganism activity may be occurring at increasingly high elevations.
- C.
It ruled out a potential alternative explanation for the acceleration in microorganism-mediated nutrient cycling.
- D.
It clarified that microorganism activity levels in the plant-soil cores varied depending on which microorganisms comprised the community.
Walk through it
Because community composition stayed the same while nutrient cycling sped up, the researchers could exclude a shift in microorganism community as the cause, isolating temperature as the driver — this rules out an alternative explanation, matching C. It doesn't merely provide preliminary evidence (A), address elevation trends (B), or show varying activity by community (D).
The traps
The text limits a claim to one factor or some cases; the trap broadens it to all factors or all cases.
The text says A causes B. The trap says B causes A, or treats an effect as a cause.
The text mentions two things separately. The trap ranks them or calls one better, when no direct comparison was made.
The procedure
- Identify exactly what the blank must explain or complete.
- Find the sentence in the passage that states the relevant cause/effect or finding. That sentence is your proof.
- Test each choice: if you cannot point to a phrase forcing it to be true, eliminate it.
- Reject choices that broaden scope, reverse direction, or invent comparisons.
- Pick the choice that echoes the text's own logic in slightly different words.
Rule, traps, and procedure drawn from the verified skill playbook for “Inferences” (drafted against real questions, verified by a second independent pass — see lib/content/playbooks/inferences.md). Worked example is a real, verified SAT practice question from the live question bank, not generated for this lesson.