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").
Q: Fact1: Infancy is the period of most rapid growth after birth., Fact2: Development means to get better, growth means to get bigger., Question: What is the period of most rapidly getting bigger after birth? (A) 86400 (B) infancy (C) adult (D) a hosta (E) pregnancy (F) adulthood (G) eight (H) angiosperm
A:
B