A. he knows he drastic change in George's manner of speaking as he is telling Lennie the story about the farm
The correct answer is C. Jazz follows a strict tradition and morality.
Jazz does not follow strict tradition and morality and is highly based on improvisation, which helped his popularity. Strict tradition would not help it.
The correct answer is A. You can receive instant feedback from your audience.
This is something that cannot be done if you are writing a text and your audience reads it at their home - they cannot immediately let you know what they think about your ideas and arguments. However, if you are giving a speech in front of an audience, then they absolutely can. B, C, and D are examples of what happens during writing, rather than speaking.
Letter
This situation is a formal situation because she is looking for a volunteer opportunity, which the same as seeking employment. Because the outcome is a position with the animal shelter, simply looking on the website would not be enough because it is possible volunteer opportunities are not posted. Too, even if there are no possibilities available, a letter (or email) is a great way (and the most appropriate) to have the hiring manager become familiar one seeking employment--paid or volunteer. This way, if a volunteer opportunity opens in the future, the shelter may be the one reaching out to her.
Additionally, a text message is too formal and should be reserved for situations not requiring the formality of professionalism. And, a memo would not be appropriate because memos are communication sent within a company or organization. As such, it would not technically be possible for her to ever a send a memo were she not already working there.
Cool? Not really sure what the question here is.