A historian using the thinking skill of primary source analysis might ​

interview civilians who are currently living in a war zone

Explanation:

A primary source refers to the source that provides the primary information of the incident. Primary information involves information received first hand. The civilians are the primary source of the information about the war. They have witnessed the evils of the wars and they would prove to give the first hand information. The historian approaching the civilians and is using the the thinking skills of the primary source analysis.

d

explanation:

letter a is the answer