Set 3: Inferences

Explanation

Answer: D

PASSAGE

Researchers measured cortisol levels in commuters using different transportation methods. Those who biked to work showed significantly lower stress hormones than those who drove, even when the biking commute was twice as long.

What does the study suggest about commuting?

A. Time spent commuting is the only factor that affects stress.

B. Physical activity during commutes may reduce stress more than the duration increases it.

C. Driving is the healthiest commute option.

D. All forms of transportation produce identical stress levels.✓ Correct

Detailed Explanation

This question asks you to draw a logical conclusion from the text. Bikers had lower stress despite twice the commute time—meaning exercise benefits outweighed time-related stress. A valid inference must be supported by evidence in the passage, even if not stated directly. Look for clues in the text that strongly suggest the answer. Avoid conclusions that require assumptions beyond what's written. Valid inferences are strongly supported by multiple pieces of evidence in the text. Be cautious of choices that go too far beyond what the passage actually states. The best inference is the one most directly supported by textual evidence.

Key Evidence:

• "lower stress hormones"

• "even when the biking commute was twice as long"

Why others are wrong: A (Longer bike commutes had less stress.), C (Drivers had higher stress.), D ('Significantly lower' shows differences.).

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