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").

[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
[A]: C


[Q]: Fact1: pollutants have a negative impact on the environment, Fact2: Environment and Health Environment and Health All living things depend on their environment., Question: pollutants have a negative impact on all what (A) tractors (B) circulatory systems (C) near the shoreline (D) living things (E) Electrical energy (F) pavement (G) potholes (H) important habitats
[A]: D


[Q]: Fact1: the number of rings in a tree trunk can be used to estimate the age of the tree, Fact2: Dendrochronologist: A person who studies tree ring growth., Question: dendrochronologists do what with regards to tree age? (A) lie about age (B) support (C) observe it (D) estimate age (E) begin age (F) focusing a lens (G) reinforce age (H) genetic diversity
[A]:
D