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: Most plants continue to grow throughout their lives., Fact2: Bamboos are vigorous, rugged plants., Question: What continues to grow throughout their lives? (A) flour (B) bamboo (C) ovaries (D) harvested wheat (E) cats (F) flowers (G) potatoes (H) tortoises
B