You will be given a definition of a task first, then some input of the task.
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: Evolution occurs by a process called natural selection., Fact2: Natural selection only selects functionally advantageous systems., Question: What is usually chosen in evolution? (A) common traits (B) Plant reproduction (C) advantageous systems (D) undesirable traits (E) Animal survival (F) competition (G) mysterious sytems (H) Earth revolving around the sun
Output:
C