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").

Sliding off concrete and onto gravel produces higher levels of (A) shine (B) value (C) longevity (D) chafing
D

Which of the following most likely led to certain rocks having less friction? (A) a babbling brook (B) people (C) a light wind (D) money
A

A koala's home can be destroyed because of (A) affection (B) magic (C) my heart (D) exploding hot liquid

D