The instinct theory of motivation was replaced by which other theory?

The correct answer is the drive theory of motivation.

The drive theory of motivation states that individuals are motivated to perform certain actions and behaviors in order to fulfill desires and urges that are inborn and important for our survival. According to this theory, the reduction of our drives (urges) is what underlies motivation. For instance, we are motivated to obtain food in order to fulfill our biologically inborn drive of hunger.