What is the formal definition of diction?

Diction can be defined as style of speaking or writing, determined by the choice of words by a speaker or a writer. Diction, or choice of words, often separates good writing from bad writing. ... Firstly, the word has to be right and accurate. Secondly, words should be appropriate to the context in which they are used.

Ibelieve he answer is a, but correct me if i'm wrong.

The details that best show evidence of tribal traditions are, "never in the history of his people had a man married a woman who spoke a different tongue” and "it has never been heard," was the verdict of an old man speaking a few weeks later.