4. $\mathrm{W}, \mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ are the midpoints of the four sides of parallelogram $\mathrm{ABCD}$. $\mathrm{P}$ is a point on the line segment $Y Z$. What percent of the area of parallelogram $A B C D$ is triangle PXW?
(A) $50 \%$
(B) $45 \%$
(C) $30 \%$
(D) $25 \%$
(E) $20 \%$
4. (D)
Parallelogram WXYZ is half of ABCD. Triangle PXW is half of WXYZ. Thus, PXW is a quarter of $\mathrm{ABCD}$. Hence (D)