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: melting is when solids are heated above their melting point, Fact2: Igneous rocks form when rocks are heated to the melting point which forms magma., Question: What do igneous rocks form into when heated? (A) magma (B) matter (C) crust (D) soils (E) rocks (F) alveoli (G) coal (H) mines
A