Question

an aroused state triggered by the need when one is out of balance?
need
instinct
drive
drive reduction

Explanation:

In psychology (a subfield of Social Science), a "drive" is defined as an aroused state triggered by a need when an organism is out of balance (homeostasis disruption). A need is the lack of something, instinct is an innate behavior, and drive reduction is a theory about satisfying drives. So the correct term for the aroused state from a need and imbalance is "Drive".

Answer:

Drive