Question

slowing the metabolic rate ______ more heat from being released in the body and further raising the internal temperature.
examines
discourages
prevents
promotes

Explanation:

Slowing the metabolic rate stops more heat from being released, which means it 'prevents' heat release. "Prevents" is the most appropriate verb here as it indicates stopping an action (heat - release). "Examines" means to look at closely, "discourages" implies giving reasons not to do something in a more psychological sense, and "promotes" means to encourage or support, none of which fit the context as well as "prevents".

Answer:

C. Prevents