Your answer would be C! Agitate means to upset or trouble someone! :)
The correct answer is - because it is being used in place of a person's name.
If doesn't matter if the person is someone of authority - you could replace 'Professor' with any other title, and you would still need to capitalize it unless you used the name as well. So, if the sentence said: Pardon me, professor Smith, (using the name of the person), then you wouldn't have to capitalize the title.
Answer:
It is about action and contributing to the common good.
When the company lists it's email on it's site, open for questions, suggestions and complaints.