There are lots of people staying at the hotel, some of have come from as far away as Australia.

A whose C that

B whom D which

from the political point of view it could be said that the candidate   is an effective speaker because she takes a strong position on the issue. it is an open discussion but probably she is making a presentation and can choose which subjects she wants to address. she is very likely to attain her aim which is to convince voters to accept her proposal.

there are many stores that have sales right before christmas

i am not sure, but i think the correct answer is a.

hope it : -)