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: Why is it fall one month and spring another month? (A) the moon has different phases (B) the earth is revolving (C) solar flares appear in cycles (D) the earth is in a different place in its orbit

Answer: D


Question: Which is the least massive? (A) the Earth (B) the moon (C) the sun (D) the solar system

Answer: B


Question: As a matters state changes, what will remain constant? (A) acceleration resistance (B) appearance (C) temperature (D) mass amount

Answer:
D