instruction:
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").
question:
What is a source of oxygen through photosynthesis? (A) lakes (B) car engines (C) sunflowers (D) people
answer:
C


question:
What are created during the pupa stage in a life cycle? (A) warmth (B) water (C) eggs (D) hard shells
answer:
D


question:
A piece of talc is rolled over on a black chalkboard and (A) burns the board (B) wipes a spill (C) makes a streak (D) makes a dent
answer:

C