Answer:
d. A social issue
Step-by-step explanation:
According to Mills, Thinking sociologically means that public issues have root on social structures and cultural components. Social issues mean that they are affecting many individuals, in this way they are not unique to anyone, so they result from common experience.
The condition of this individuals arises in the form of a social problem, so its negative outcomes are studied on the basis of objective and subjective factors: Think of unemployment, how many people are in this situation, now how unemployment affects poverty, which in turn can be the product of technological shifts.
All these three components could lead us to see the interaction among these variables and provide some partial answers to tackle them.