The answer is 9/c. The key word in the problem is "quotient". That means the answer will be a fraction. I found information for you to use in the future.
How do we write the word expressions below into algebraic expressions?
Sum of x and 5 → x+5
Difference of y and 3 → y-3
Product of n and 2 → 2n
Quotient of k and 7 → k/7