Although instincts cannot explain most human motives, the underlying assumption that genes predispose some species-typical behaviors continues in:

The correct answer is evolutionary psychology.

Evolutionary psychology is a branch of psychology which uses the evolutionary perspective to study the origin of human psychological traits.
The drive-reduction theory suggests that an organism is driven and motivated to act based on its physiological needs.
The arousal theory states that humans are motivated by an innate desire to keep an optimum level of arousal.