You will be given a definition of a task first, then some input of the task.
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: Hydrogen bonds cause water to expand when it freezes., Fact2: Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin., Question: Something that is primarily electrostatic in origin causes water to expand when it what? (A) heat (B) freezes (C) a hazard (D) boiling (E) moves (F) reacts (G) expelled (H) it's state
Output:
B