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It is much easier for a small animal to run uphill than for a large animal, because
A
small animals have a higher metabolic rate.
B
small animals have low $O_2$ requirement.
C
the efficiency of muscles in the large animals is less than the small animals.
D
it is easier to carry a small body weight.
Explanation
Smaller animals have higher mass-specific metabolic rates.
Detailed Solution
The metabolic rate of an organism at rest at normal temperature is its basal metabolic rate (BMR). BMR is inversely proportional to body weight.
Small animals have a higher BMR, so they get more energy and can run uphill more easily than larger animals.
Small animals have a higher BMR, so they get more energy and can run uphill more easily than larger animals.