Final answer:
Drive-theorists describe the organism's motivation for balance as homeostasis, which motivates actions that restore the body's internal balance.
Step-by-step explanation:
The term that drive-theorists use to describe the organism's motivation for balance is homeostasis. Homeostasis is the process by which an organism maintains a state of internal balance or equilibrium. Within the context of drive theory, deviations from homeostasis create physiological needs. These result in psychological drive states that motivate an organism to perform actions that will bring its systems back to the balanced state, or set point. For example, hunger is a drive state that motivates an organism to seek food and restore energy levels, thus ensuring that blood sugar levels return to homeostasis.