Students in the sixth and seventh grade at your school are going on a field trip to the Science Museum. If a student returns his or her permission slip by May 1, then he or she is entered into a raffle to win a $25 gift card to the museum gift store. The table below shows the
number of students in each grade and from each homeroom who returned their permission slip by May 1.

One student will win the raffle by random selection. What is the probability that
A. The winner is a seventh grader? B. The winner is a seventh grader from home room 2? C. The winner is from homeroom 3? D. The winner is not from homeroom 1?