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: Zooplankton are tiny animals that feed on phytoplankton., Fact2: Many zooplankton are crustaceans., Question: What can feed on phytoplankton? (A) producers (B) phytoplankton (C) passenger pigeons (D) bacteria (E) tiny crustaceans (F) the Sun (G) honeybees (H) parasites
[EX A]: E

[EX Q]: Fact1: cold fronts cause thunderstorms as they pass by, Fact2: If cold air replaces warm air, it is called a cold front., Question: What does cold air replacing warm air cause? (A) Greenhouse gases (B) Pollution (C) Dehydration (D) thunderstorms (E) steady barometer readings (F) hypothyroidism (G) constant air pressure (H) stagnant air temperature
[EX A]: D

[EX Q]: Fact1: air pollution can cause the pH of soil to decrease, Fact2: Acidity increases as the pH number decreases, and alkalinity increases as the pH number increases., Question: What can increase soil acidity? (A) Air pollution (B) Organic compounds (C) humans disturb it (D) cactuses (E) flooding (F) deforestation (G) Pollution (H) harmful substances
[EX A]:
A