In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
--------
Question: Using mirrors to focus collected light from heavenly bodies allows (A) detailed observation (B) foregone conclusions (C) radiation experiments (D) celestial music

Answer: A

Question: heat and pressure change the remains of what into natural gas? (A) leaves (B) cans (C) books (D) cars

Answer: A

Question: A stately red maple in a dense forest is supported by its (A) pine needles (B) trunk (C) leaves (D) upward thrust

Answer:
B