Final answer:
The term 'herd behavior' has its origins in animal herds and describes how individuals in human crowds can act collectively, influenced by innate social tendencies and emergent social norms.
Step-by-step explanation:
The origin of the term "herd behavior" is b) It originates from the behavior of animals in herds. This concept has been observed in humans, where individuals act collectively and often emotionally, particularly in situations that are noninstitutionalized or lack direct regulation. Collective behavior in humans can manifest in various forms, like crowds, masses, and the public. According to the emergent norm theory, crowds can develop their own social norms which influence individual behavior within the group. Herd behavior in humans showcases our innate and evolutionary tendencies to form groups and align with group dynamics, often leading to actions that are driven by the collective rather than individual rational thought.