Final answer:
Drive is a state of bodily tension from an unmet need, pushing behavior to satisfy that need and return to homeostasis.
Step-by-step explanation:
The best definition of drive is a state of bodily tension that arises from an unmet need. According to the drive theory of motivation, physiological needs arise from deviations from homeostasis, which in turn create psychological drive states. These drive states push an individual to engage in behaviors that will satisfy the need and restore homeostasis. For instance, hunger is a drive that results when blood sugar levels drop, compelling us to eat and thus returning our blood sugar levels to normal.