Answer:
The correct option is D. Gibbons will eventually become extinct in the wild.
Step-by-step explanation:
The habitat where a species lives has enormous effects on the survival rate of a population. If the trees of southeast Asia are removed,the carrying capacity for Gibbons is reduced for that area. As a result, the organisms will fight for the scarce resources present in the habitat. Most of them would die due to lack of proper resources. As the carrying capacity goes on reducing, the gibbons will come to a verge of extinction i.e they will become endangered. Is the carrying capacity further reduces, then they will become extinct.