Which of the following numbers is a perfect square?

**Answer Choices**

A. \dfrac{14 ! 15 !}{2}

B. \dfrac{15 ! 16 !}{2}

C. \dfrac{16 ! 17 !}{2}

D. \dfrac{17 ! 18 !}{2}

E. \dfrac{18 ! 19 !}{2}

Which of the following numbers is a perfect square?

**Answer Choices**

A. \dfrac{14 ! 15 !}{2}

B. \dfrac{15 ! 16 !}{2}

C. \dfrac{16 ! 17 !}{2}

D. \dfrac{17 ! 18 !}{2}

E. \dfrac{18 ! 19 !}{2}