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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.