According to existing research, chimpanzees Select one: a. do not use tools. b. have complex grooming and courtship behaviors. c. cannot solve technical problems. d. All of the choices are correct.

option b. have complex grooming and courtship behaviors is correct answer.

Explanation:

According to a research paper published in American journal of primatology provided evidences that chimpanzee males, as promiscuous breeders with minimal costs to mating, should show little or no preference when choosing mating partners (e. g. should mate indiscriminately).

Reference: Proctor, D. P., Lambeth, S. P., Schapiro, S. J., & Brosnan, S. F. (2011). Male chimpanzees' grooming rates vary by female age, parity, and fertility status. American journal of primatology, 73 (10), 989-996. doi:10.1002/ajp. 20964