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").

A light using energy can cease that activity when (A) light bulbs are gold (B) lights are always on (C) wall switch is adjusted (D) walls are painted blue
C

A tone is made when a hammer makes contact with (A) a waterfall (B) air (C) an solid object (D) a log
C

When writing with an instrument one sharpens, the leftovers when pressed to paper is (A) a squid (B) glowing (C) a mineral (D) bright white

C