From what i read it would have to be D
The correct answer that would best complete the given statement above would be option B. selective. <span>Colleges that only have a limited number of seats are said to be more SELECTIVE. Since there are only limited seats, these seats should be given to those who have been properly selected. Hope this answers your question.</span>
I would have to say A would probably be the best answer because the others are just a regular sentence telling them about the positive things about volunteering but A has a quote and to me that helps get people interested better.