Refer to the Figure Shown

Refer to the figure shown.
What is this figure showing?

A) Maximum metabolic rate at various temperatures in summer-acclimatized and winter-acclimatized reindeer
B) Resting metabolic rate at various temperatures in summer-acclimatized and winter-acclimatized reindeer
C) Maximum metabolic rate at various temperatures in a northern species and southern species of reindeer
D) Resting metabolic rate at various temperatures in a northern species and southern species of reindeer