To find the area of the base of a right rectangular prism, you can use the volume formula:
\[ V = \text{Base Area} \times \text{Height} \]
Given that the volume \( V \) is 50 cubic feet and the height \( h \) is 4 feet, we can rearrange the formula to solve for the base area:
\[ \text{Base Area} = \frac{V}{h} \]
Substituting the known values:
\[ \text{Base Area} = \frac{50 \text{ ft}^3}{4 \text{ ft}} = 12.5 \text{ ft}^2 \]
Thus, the area of the base is \( 12.5 \text{ ft}^2 \) or \( 12.5 \text{ feet squared} \).
So the correct answer is:
12.5 ft.² (or 12.5 feet squared)