If $3 \times 3 \times 5 \times 5 \times 7 \times 9=3 \times 3 \times 7 \times n \times n$, what is a possible value of $n$ ?
(A) 15
(B) 25
(C) 45
(D) 35
(E) 5
Since

$$
3 \times 3 \times 5 \times 5 \times 7 \times 9=3 \times 3 \times 7 \times n \times n
$$

then

$$
n \times n=\frac{3 \times 3 \times 5 \times 5 \times 7 \times 9}{3 \times 3 \times 7}=5 \times 5 \times 9=5 \times 5 \times 3 \times 3
$$

Since $n \times n=5 \times 5 \times 3 \times 3$, then a possible value for $n$ is $n=5 \times 3=15$.

ANSWER: (A)