Detailed Instructions: 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").
Problem:It is much harder to go star gazing in the city as opposed to the mountains due to the amount of factories doing what to the air (A) dirtying it (B) air horns (C) candy (D) tables
Solution:
A