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").

[EX Q]: Which is a byproduct of a lightbulb? (A) taste (B) death (C) warmth (D) sound
[EX A]: C

[EX Q]: which of these formations are typically the highest point from sea level? (A) the sandy river bank (B) a long river channel (C) a cooled lava top (D) a lush green valley
[EX A]: C

[EX Q]: When the moon, sun, and earth line up, tides are at their (A) Happy (B) Max (C) Min (D) Middle
[EX A]:
B