#1**0 **

we can first calculate the rectangle beneath the smicircle's area, which is 20x25=500

we see that the radius of the semicricle is 12.5, and the area of the circle is $\pi$r$^2$, so the area of the semicircle is:

$\frac{\pi r^2}{2}=\frac{3.14\cdot156.25}2=245.3125$

500+245.3125=745.3125

It is most likely the 4th one.

SparklingWater2 Mar 9, 2021