During the talk described in paragraph 2, the author responds to her mother's presence by:A. altering the vocabulary and syntax she had been using to express her ideas to the groupB. regretting that there are certain interests she does not share with her motherC. thinking about how audience determines the appropriateness of a styleD. deciding that her mother does not need to learn academic English

C. thinking about how audience determines the appropriateness of a style.

Explanation:

In this text, the author reflects on the use of language by different kinds of people. She is aware of her ability to use language effectively in a variety of settings. She is also aware of the fact that her mother's language skills are a lot more limited. However, the author also reflects on the fact that her mother's abilities are not as bad as people might assume, and that many specific factors need to be taken into account in order to judge this properly. One of these factors is the fact that audience often determines the appropriateness of a style.