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: a mutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring, Fact2: Upon reproduction, offspring are subject to mutation., Question: What causes new traits because of reproduction? (A) snail (B) mutation (C) animals (D) coded genes (E) gene flow (F) hormones (G) flowers (H) insects
Output:
B