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").

[EX Q]: Fact1: the force of water against the seed coat causes a root to emerge from a seed, Fact2: Water is made up of H2O molecules., Question: what is forced against the seed coat to cause the root to emerge from a seed? (A) germination (B) UV (C) urea (D) h2o (E) sunflower (F) rain (G) oil (H) newtons
[EX A]: D

[EX Q]: Fact1: Some viruses can cause cancer., Fact2: Cancer is an example of a mutation in cells., Question: What can mutate cells? (A) Allergies (B) water (C) fruits (D) flow of electrons (E) vegetables (F) harmful substances (G) rays or beams (H) some viruses
[EX A]: H

[EX Q]: Fact1: a compass is used to navigate oceans, Fact2: Navigation by compass is especially difficult during a magnetic storm., Question: Navigating the oceans can be more difficult during (A) lunar eclipses (B) a cold environment (C) Differences in speed (D) rapid changes occur (E) Plate tectonics (F) beach erosion (G) magnetic storms (H) Being over land
[EX A]:
G