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: plant requires seed dispersal for reproduction, Fact2: Reproductive investment was measured as seed mass, samara size, and dispersal ability., Question: What requires investment, seed mass, size and dispersal? (A) plants (B) Species (C) animals (D) coral (E) Oak (F) gene flow (G) Frogs (H) mussels
[EX A]: A

[EX Q]: Fact1: pollutants have a negative impact on the environment, Fact2: Carbon dioxide is a pollutant., Question: What affects the environment negatively? (A) sunlight (B) normal weather patterns (C) carbon dioxide (D) cigarettes (E) positivity (F) Smoking (G) harmful substances (H) fossil fuels
[EX A]: C

[EX Q]: Fact1: Carbon cycles quickly between organisms and the atmosphere., Fact2: Carbon dioxide is controlled by the carbon cycle., Question: what is controlled between organisms and the atmosphere? (A) carbon dioxide (B) sweating (C) temperature (D) air pressure (E) heat energy (F) Pollution (G) energy usage (H) Chemical energy
[EX A]:
A