The correct option is B Agenda
The word for the phrase 'List of headings of a business to be transacted at a meeting' is Option B, Agenda. Option A 'Schedule' is the list of planned activities with date and time. Option C 'Proceedings' is the series of events that happen in a planned and controlled way. Option D 'Excerpts' is a short part taken from book, speech or film. Thus, options A, C and D are incorrect and the correct word for the given phrase is Option B, Agenda.