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").

What is a source of oxygen through photosynthesis? (A) lakes (B) car engines (C) sunflowers (D) people
C

A person yells inside a garage. Their voice echoes and they hear (A) a bird chirping away (B) a dog barking loudly (C) a car engine rev (D) a shout repeating softer
D

An example of a fossil is the bones of what kind of animal? (A) toy (B) live (C) programmed (D) wiped out

D