Answer:
A) Although we have paid for our trip, we still need to find chaperones for the event.
Step-by-step explanation:
This answer gets straight to the point, which is asking Ms. Pembroke to be a chaperone.
I have chosen A because B and C seem to be irrelvant. C could be a possible answer, but it does not say anything about Ms. Pembroke. Therefore, A is the best choice.