The circumference \( C \) of a circle can be calculated using the formula:
\[ C = 2\pi r \]
where \( r \) is the radius of the circle. Given that the radius \( r = 2.5 \) feet and using \( \pi \approx 3.14 \):
\[ C = 2 \times 3.14 \times 2.5 \]
Calculating this step-by-step:
- Multiply \( 2 \times 2.5 = 5 \)
- Then multiply \( 5 \times 3.14 = 15.7 \)
Thus, the circumference is approximately \( 15.7 \) feet.
Therefore, the correct response is:
15.7 feet