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: a compass is used to navigate oceans, Fact2: And to the east is the Atlantic Ocean., Question: what is a compass used to navigate? (A) density (B) lamphreys (C) marine (D) outer space (E) their speed (F) Antarctica (G) non-magnetic planets (H) the Atlantic
H

Fact1: Flagella help prokaryotes move., Fact2: Most prokaryotes are unicellular., Question: What helps unicellular organisms move? (A) evaporation (B) bacteria (C) heat energy (D) glucose (E) sweating (F) flagella (G) legs (H) blood
F

Fact1: Vesicle transport requires energy, so it is also a form of active transport., Fact2: Active transport involves movement of substances against a chemical gradient., Question: Why does vesicle transport need energy?  (A) it helps plants in growing (B) to prevent movement (C) for movement of substances (D) during the day (E) Transfers energy (F) flow of electrons (G) to breath (H) magnetism

C