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: Roots have primary and secondary meristems for growth in length and width., Fact2: Rulers are used to measure length., Question: The growth in what comes from primary and secondary meristems can be measured with a ruler? (A) bushes (B) years (C) Trees (D) three (E) roots (F) bamboo (G) rings (H) a prism
E