8

Set 3: Inferences

Explanation

Answer: B

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.✓ Correct
C. Driving is the healthiest commute option.
D. All forms of transportation produce identical stress levels.

Detailed Explanation

Bikers had lower stress despite twice the commute time—meaning exercise benefits outweighed time-related stress.

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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