The large size of the musk ox
a.
minimize heat loss
b.
is offset by its long legs
c.
the animal graze less often
d.
maximize heat loss

A.  Helps minimize heat loss

Explanation:

The musk ox is found in cold climatic regions. Its larger body size imparts it a smaller surface area relative to its volume. The lesser surface area, relative to its large volume, exposed to the surroundings helps the organism to lose less heat. Hence, a smaller surface area to volume ratio of musk ox, as contributed by its larger body size, help it to stay warm in cold climates.

the answer would be   10%