In the chart, the products of the numbers represented by the letters in each of the rows and columns are given. For example, xy=6 and xz=12. If x,y,z, and w are integers, what is the value of xw?
\begin{array}{|c|c||c|}
\hline x & y & 6 \\
\hline z & w & 50 \\
\hline \hline 12 & 25 & \\
\hline
\end{array}
Answer Choices
A. 150
B. 300
C. 31
D. 75
E. 30