Answer:
A)
Though they sound like strange birds, these singers
don't have feathers or wings.
D. The thesis. It's going be your statement that you're trying to prove.
You'll want to leave it out. if it isn't conducive to the content of your paper, it's more like a distraction from what you're trying to say. parentheses might be a "safe" way to signify a side topic, but it weakens the paper as a general statement because the reader has to pause and take a moment to absorb a new topic before going back to what you were saying
