Since a bird's body temperature can increase as much as 10 degrees Fahrenheit during long, strenuous flights, birds are in danger of overheating during the prolonged flights typical of seasonal migrations. This risk is greater during daylight hours than at night, because air temperatures are generally lower at night. It is, therefore, likely that the tendency of many bird species to migrate at night is due to the need to avoid overheating.
Which of the following, if true, most strengthens the argument given?
Since as per conclusion overheating is the reason behind birds migrating at night as temperature is low, something about the temperature in the below choices shall be helpful to support the conclusion.
A. Birds that migrate in warmer months are more likely to migrate at night than are those that migrate in colder months. - CORRECT. A comparison of bird migratory behavior w.r.t. warmer months and colder months in the desired directions strengthens the argument here.
B. Birds that migrate during the daytime are in danger of being blown off course by atmospheric turbulence, which is strongest during daylight hours. - WRONG. Irrelevant.
C. Birds that begin to overheat during migration can lower their body temperature significantly by briefly stopping to rest. - WRONG. Opposite to what is sought to strengthen the argument.
D. Nighttime migration enables birds to avoid certain predators by flying in the dark and remaining hidden during the daylight hours. - WRONG. Irrelevant.
E. Nighttime migration enables birds to forage by daylight, when they can most readily find food. - WRONG. Irrelevant.
IMO Answer A.
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