To find the circumference \( C \) of a circle using the formula \( C = \pi d \), where \( d \) is the diameter, you can plug in the given diameter and the value of \( \pi \).
Given:
- Diameter \( d = 3.75 \) feet
- \( \pi \approx 3.14 \)
Now, substitute these values into the formula:
\[ C = \pi d = 3.14 \times 3.75 \]
Calculating this:
\[ C = 3.14 \times 3.75 = 11.775 \]
Now, round to two decimal places:
Thus, rounding \( 11.775 \) gives us \( 11.78 \).
So the correct response is:
11.78 ft