Detailed Instructions: 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").
Problem:Fact1: exercise increases a body 's strength, Fact2: For exercise, Alan runs and rollerblades., Question: What can increase a body's strength? (A) four limbs (B) disease (C) running (D) biceps (E) infection (F) stretching (G) Limbs (H) movement
Solution:
C