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: Skin color is another polygenic trait., Fact2: Most dental variations are polygenic, that is controlled by several genes., Question: Skin color is a trait controlled by what? (A) prokaryotic cells (B) one gene (C) enzymes (D) keratin (E) one's descendants (F) several genes (G) the environment (H) a single gene
F

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
C

Fact1: a mirror is used for reflecting light, Fact2: Typical mirror materials are quartz or nickel plated aluminum., Question: what are used for reflecting light? (A) extremely important (B) Electrical energy (C) an electron lens (D) Bundles of fibers (E) quart or nickel plated aluminum (F) an external framework (G) that material's properties (H) To another location like underground

E