Task: Question Answering
Input (English): Helena investigates how enzymes are important to body processes. How is the role of enzymes in biochemical activity best explained?  
 (A) Enzymes work at all pH levels. (B) Enzymes decrease the rate of metabolism. (C) Enzymes enable reactions to occur at lower temperatures. (D) Enzymes raise the activation energy needed for a reaction.
Output (English): C