Q: 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 prohibits cells from contorting into deformed shapes? (A) helpful viruses help them retain their function (B) a prison cell wall contains them (C) the thin membrane which surrounds them (D) they have a Chilton's manual to guide them
A:
C