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: the mass of a planet causes the pull of gravity on that planet, Fact2: Gravity is the pulling force that holds objects to the surface of a planet., Question: The mass of a planet causes the pulling force that does what? (A) holds objects to its surface (B) deadly and devastating (C) a tree falling (D) principals of aerodynamics (E) causes weather (F) to move people (G) forces air to the surface (H) changes rotations
A:
A