4. Bryn adopted her cat, Minnie, from the local shelter. She feeds Minnie dry food, but the previous owner fed her canned food. Every time Bryn opens her refrigerator, her new cat comes running. Bryn never gives Minnie food after she opens the refrigerator, however, so eventually Minnie stops showing up. Once in a while, though, Minnie will come running when Bryn opens the refrigerator, as if food is forthcoming. This reappearance of Minnie's old behavior is called: *

Spontaneous recovery

Explanation:

Spontaneous recovery: In psychology, the term "spontaneous recovery" is described as one of the memory and learning phenomenon that was introduced by a psychologist named Ivan Pavlov in his theory of classical conditioning theory, and is referred to as the re-emergence or re-occurrence of a formerly extinguished "conditioned response" after some time or gap.

In the question above, the given statement represents spontaneous recovery.

c. wright mills's sociological imagination suggest investigating to explain this increase?