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A. Some monarch butterflies migrate over an area 10 times larger than the area over which any other insect of similar size migrates.
This simply restates the original observation that monarchs migrate farther than other insects. It adds nothing about why they do so.

B. The monarch butterfly is more resilient to changes in atmospheric conditions than members of most other insect species.
This directly contradicts the explanation.

C. During their breeding season, monarch butterflies must find a habitat suitable for both themselves and their newly hatched young.
This introduces a competing explanation for migration — breeding requirements — rather than confirming the atmospheric conditions mechanism.

D. Sometimes individual monarch butterflies spend their entire lives near a single location and never migrate.
This weakens the explanation by demonstrating that atmospheric conditions do not universally force migration in all monarchs

E. Monarch butterflies migrate larger distances in years when atmospheric conditions stray further from the range healthy for them than they do in years when atmospheric conditions remain favorable to them.
Correct. This directly confirms the causal mechanism by showing that migration distance varies in proportion to how far atmospheric conditions deviate from the suitable range. Better conditions produce shorter migrations; worse conditions produce longer ones.

Ans E

ExpertsGlobal5
Monarch butterflies migrate much farther than do other insects of similar size. The reason for this behavior is that the range of atmospheric conditions in which monarch butterflies can survive is especially narrow, forcing the butterflies to travel more frequently and extensively to find a suitable habitat.

Which of the following, if true, most helps to confirm the explanation above?

A. Some monarch butterflies migrate over an area 10 times larger than the area over which any other insect of similar size migrates.
B. The monarch butterfly is more resilient to changes in atmospheric conditions than members of most other insect species.
C. During their breeding season, monarch butterflies must find a habitat suitable for both themselves and their newly hatched young.
D. Sometimes individual monarch butterflies spend their entire lives near a single location and never migrate.
E. Monarch butterflies migrate larger distances in years when atmospheric conditions stray further from the range healthy for them than they do in years when atmospheric conditions remain favorable to them.


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