pick from the following.
[I] mating
[II] hibernation
[III] reproduction
[IV] gestation
Given those answer options, answer the question: Answer the following question given this paragraph: Gestation (pregnancy) lasts 8-9 months and usually results in the birth of a single offspring. The young are born helpless, and thus, they need parental care for long periods of time. Compared with most other mammals, great apes have a long adolescence and are not fully mature until 8-13 years of age (longer in humans). Females usually give birth only once every few years. Q: In great apes, what process lasts 8-9 months and usually results in the birth of a single offspring? A:
A:
[IV]