Task: Question Understanding
Input (English): Question: Which one of the following statements best explains why we use simple machines? (A) A simple machine can change the direction or amount of force to make work easier. (B) A simple machine can change the amount of Earth's gravity acting on an object to make it lighter. (C) A simple machine can change the magnetic attraction and repulsion of an object to create energy. (D) All of the answers are correct.?
Output (English): explains, use, simple, machines?