Q: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
[header] How to introduce yourself before giving a seminar [title] Pick the correct length of time. [step] Time allocation should conjure up images of goldilocks. It has to be. <sep> (A) The start of a presentation might be 20 minutes, the end is 20 minutes. You can also shorten as much time as 12 minutes as you want. (B) Write a brief note reminding yourself of this. Write down the time of day in a timed notebook somewhere along the length of time you intend to give the seminar. (C) Too long and you waste the audience's time. Too short and the audience is disoriented. (D) If you're planning a seminar in a more formal setting, then the time isn't as important. [title] Start booking, not handing out the prerequisite details.
A:
C