Primary drives are a. influenced by stimuli outside the body b. learned c. exceptions to the drive-reduction principle d. based on a physiological state

I believe the answer is: d. based on a physiological state

The physiological state that triggers primary drives would be related with our instinct to survive in the environment. Several examples of primary drives are Hunger, Thirst, Desire to have sex and passing on our genes, Desire to obtain a sense of security , etc.

The answer would be limited.