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]: An echo is produced by what type of reflection of sound source? (A) Direct (B) Distant (C) Varied (D) Single
[EX A]: D

[EX Q]: Flowers with more pollinators (A) escalate reproduction (B) increase water usage (C) increase visual appeal (D) decrease reproduction
[EX A]: A

[EX Q]: Instinctive behavior may be viewed when observing (A) freshly hatched turtles seeking water (B) birds being trained to play games (C) cats being fed salami (D) dogs riding in cars
[EX A]:
A