Students in the 7th and 8th grade at Imawinner Middle School are going on a field trip to the aquarium. If a student actively participates in the engagement activities at the aquarium, they are entered into a raffle to win a free lunch from their favorite restaurant. The table below shows the number of students in each grade and homeroom who engaged in the activities.
| Homeroom A | Homeroom B | Homeroom C |
| 7th Grade | 8 | 10 | 7 |
| 8th Grade | 9 | 10 | 9 |
What is the probability the winner is a 7th grader in Homeroom C?
A. 7/9
B. 7/25
C. 7/16
D. 7/53
The total number of students who actively participated in the engagement activities at the aquarium is 8 + 10 + 7 + 9 + 10 + 9 = 53.
The number of 7th graders in Homeroom C who participated is 7.
Therefore, the probability that the winner is a 7th grader in Homeroom C is 7/53.
The answer is D. 7/53.