"Which is not necessary in a historical essay" is first-hand accounts .
Answer: Option B
Step-by-step explanation:
When you write a historical essay, you are referring to the various sources which you will be citing to support your claims as history is written in different ways by different people such that it is each of them have their own version of the history.
History is prone to interpretation, so people who write the essay must state their interpretations of the historical facts and figures. Evidence also matters because evidences of a historical essay can help in amplifying the claims of the essay and support the statement being made. In such an essay, a first-hand account is not required.