In order to calculate the area of the half-oval at the top, we will use:
Area = (minor radius x major radius x pi)/2
Area = (1.25 x 2 x 3.14) / 2
Area = 3.92 ft²
Now, we calculate the area of the rectangular section:
Area = 4 x 2.5
Area = 10 ft²
Total area = 10 + 3.92 = 13.92 ft²
The answer is B.