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Let's identify the two conflicting facts:

Fact 1: Cross-trainers spend MORE time on their feet during recovery
Fact 2: Cross-trainers heal FASTER
General Rule: Injured body parts used regularly heal SLOWER

The Puzzle: If using an injured part slows healing, why does more foot usage lead to faster healing?

What We Need: Something that explains how more usage can actually help healing.
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Why (A) is Correct

Answer (A) provides the missing mechanism:

Standing more → Increased blood flow to feet → More nutrients reach injured muscles → Faster healing

The benefit (more healing nutrients delivered) outweighs the cost (additional stress from usage). This perfectly resolves the paradox.
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Why Other Choices Fail

(B) Confidence to start walking: This explains WHY people walk more, but not why walking more helps them heal. It actually deepens the paradox.

(C) Increased demand for nutrients: Opposite effect! If activity increases nutrient demand, there would be LESS available for healing. This would make healing SLOWER, not faster.

(D) Middle-aged individuals: This tells us about a group for whom cross-training doesn't work. We need to explain why it DOES work, not when it doesn't.

(E) Feet injuries need more rest: This supports the idea that rest helps feet injuries, which would make cross-training bad. This strengthens the paradox rather than resolving it.

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In paradox questions, you can look for an answer that introduces a new factor that reconciles the two conflicting observations. The correct answer will show how both facts can be true simultaneously.

Answer: A
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Those who practice cross-training while recovering from feet injury spend more time on their feet than those who do not. Even accounting for disparities in the severity of the injuries, those who practice cross-training heal faster than do those who do not. This is puzzling because an injured body part that is put into regular use typically heals slower than one that is allowed to rest.

Which of the following, if true, best resolves the apparent discrepancy described in the passage?

A. Spending time on their feet increases the patients’ blood flow to feet, causing the injured feet muscles to absorb more of the nutrients needed to heal.
B. Cross-training increases the patients’ confidence, encouraging them to start walking.
C. Increased activity leads to an increased demand for nutrients needed to heal injuries.
D. Cross-training does not increase the recovery rate of middle-aged individuals, if they had not undergone cross-training before.
E. Those recovering from feet injury need more rest than those recovering from other injuries do.

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