The answer is connected with the main use the body makes of food— to supply the energy for movement.
A. where
B. why
C. what
D. that
网友回答
A. where
B. why
C. what
(答案→)D. that
解析：考查定语从句。句中先行词为the main use在句中作为make的宾语，故用关系词that。句意：这个答案与人体主要利用食物来提供活动的能量有联系。