The idea of cause and effect, Hume thinks,
a. is based on our experience of constant conjunctions between pairs of events
b. provides the bridge that gets us to things as they really are independent of our impressions of them
c. embodies no idea of the necessary connection between cause and effect
d. is one of those apriori clear and distinct ideas that we can rely upon in
e. proving the existence of things that are the external causes of our ideas

Letter A is the correct answer.

As a matter of fact, people can create ideas from simple impressions, which can be by  contiguity, resemblance, and cause and effect. David Hume was a very well-known British empiricist in the Early Modern Period who suggested that the idea of cause and effect is simply based on the discovery of relations between pairs of events and that assumptions of cause and effect between a pair of events cannot been considered 100% true. According to him, unless there is a rule that the future will always resemble the past, we can't justify what we believe is true based on past experiences.

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

this is called police cynicism. i hope this .