Given the task definition and input, reply with output. In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: Fingernails prevent injury by forming protective plates over the ends of the fingers., Fact2: Fingernails become more brittle with age., Question: What do fingers have over the ends that become more brittle with age? (A) tiny hairs (B) far fewer in number (C) protective plates (D) Major effects (E) It's inherited from genes (F) protection (G) changes in size (H) several genes
C