Detailed Instructions: 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: sedimentary rocks are formed by deposition, Fact2: Limestone is a type of sedimentary rock., Question: How is limestone formed? (A) In sediment (B) Deposition. (C) Metamorphic processes. (D) Igneous processes. (E) Magma processes. (F) less water (G) Water expanding (H) It expands
A:
B