Crystal agreed to serve on a company's advisory board and now has to contact them to say she cannot attend a scheduled meeting where she was to be one of several key speakers. What should she do?

Question

Let the company know she cannot not attend and that they will have to make arrangements for another speaker.
Ask the company to cancel the meeting.
Offer to send a knowledgeable colleague in her place.
Resign from the advisory board before the meeting date.

Answer 1

I don't think she should resign, or ask to cancel the meeting. Is it appropriate to offer a replace? Or should the company take care of that?
A or C? Just to be polite I would go with c

Answer 2

I would say Let the company know and ask them to make other arrangements for a speaker.