Question

which is an advantage of speaking? a. you can keep a permanent record of your conversation. b. you can immediately answer questions your audience might have. c. you can provide an unbiased and unemotional account of events. d. you can take the time to organize your thoughts and word choice.

Answer 1

The advantage of speaking is that B. you can immediately answer questions your audience might have.
You do not have this opportunity when it comes to writing - you first need to have your audience read your writ, and then let them ask you questions, if even that is possible.