You are presented with the quiz "What does perspiration do?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sweating reduces body heat" and "causes Body heat is lost mainly through perspiration or sweating".   So, what's the best answer to the question?
Possible answers:
 (A). It expands;
 (B). Cooling vapors;
 (C). decreases;
 (D). Reduces body heat;
 (E). Release energy;
 (F). Causes shivering;
 (G). Reduces sweat;
 (H). Causes heat stroke;
(D).