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: a tape measure is used to measure length, Fact2: All sizes are total length., Question: a tape measure is used to measure what? (A) waves (B) salinity (C) all sizes (D) speed (E) layers of fat (F) Weight (G) heat energy (H) forces
C