For his speech on learning a second language, connor developed the following: "when we learn a second language, we learn to appreciate the culture of the people who speak that language and we also increase our understanding of our own culture.". this is connor's

a. general purpose
b. specific purpose
c. thesis statement or central idea
d. main point

This is Connor's THESIS STATEMENT OR CENTRAL IDEA.

Explanation: A Thesis statement appears at the end of the introductory part an essay, statement or academic paper that clarifies the main point of the text.

An article published by independent on Monday 15 February 2016 written by Steve Connor illustrates that he has two main deas: first, that learning a second language helps people appreciate the culture of the people who speak the language; second, that learning a second language helps us increase our understanding of our own culture.

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

i would say b. research typically uses a variety of sources