The correct option is B.
Step-by-step explanation:
The area of pyramid is the sum of area of rectangular base and 4 triangular sides. Two triangle have base 18 ft and height 14.1 ft. Other two have base 10 ft and height 16 ft.
The area of rectangle is
![A=length\times width](/tpl/images/0440/5567/596a0.png)
Length of the base is 18ft and width is 10ft.
![A_1=18\times 10=180](/tpl/images/0440/5567/14fe7.png)
The area of a triangle is
![A=\frac{1}{2}\times base \times height](/tpl/images/0440/5567/89d98.png)
The area of triangle with base 18 ft and height 14.1 ft is
![A_2=\frac{1}{2}\times 18 \times 14.1=126.9](/tpl/images/0440/5567/aff39.png)
The area of triangle with base 10 ft and height 16 ft is
![A_3=\frac{1}{2}\times 10 \times 16=80](/tpl/images/0440/5567/206a3.png)
The total surface area of the rectangular pyramid is
![A=A_1+2\times A_2+2\times A_3](/tpl/images/0440/5567/98326.png)
![A=180+2\times (126.9)+2\times (80)](/tpl/images/0440/5567/d31fc.png)
![A=593.8](/tpl/images/0440/5567/8bab3.png)
The surface area of the rectangular pyramid is 593.8 ft². Therefore the correct option is B.