"<span>to remind staff about a workshop" would be a good situation in which it would be </span>most appropriate to send a memorandum, since memos are used for relatively insignificant things.
I'm sorry, but we need to see the story to answer this question. If you could get a picture of the story then explain what to do that would be great. Sorry for the inconvenience.
The answer to your question is D.
Answer:
hold on did this already give me a sec
Explanation: