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?

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.

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

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

In this situation, Crystal should contact the company to inform them that she cannot attend the scheduled meeting where she was supposed to be one of the key speakers. There are a few options she can consider:

1. Let the company know she cannot attend and that they will have to make arrangements for another speaker: Crystal should politely communicate her inability to attend the meeting and explain the reasons for her absence. She should offer suggestions for finding a replacement speaker, if possible.

2. Ask the company to cancel the meeting: While this is an option, it should be considered as a last resort. Canceling a meeting may inconvenience other attendees and disrupt the company's plans. Crystal should try to find an alternative solution before considering this option.

3. Offer to send a knowledgeable colleague in her place: If Crystal knows someone who is well-versed in the subject matter of the meeting, she can suggest sending that person as a substitute. She should provide the necessary contact information and details to facilitate the arrangement.

4. Resign from the advisory board before the meeting date: If Crystal feels that she cannot commit to fulfilling her responsibilities as an advisory board member, she can choose to resign from the position. However, it's important to consider the implications of this decision and to handle it professionally by providing sufficient notice and explanations to the company.

Ultimately, Crystal should consider the specific circumstances and importance of the meeting, as well as communicate with the company in a timely and professional manner to find the best solution.