To find the circumference of a circle, you can use the formula:
\[ C = \pi \times d \]
where \( C \) is the circumference and \( d \) is the diameter. Given that the diameter is 4.5 miles and using \( \pi \approx 3.14 \):
\[ C = 3.14 \times 4.5 \]
Now, let's calculate that:
\[ C = 3.14 \times 4.5 = 14.13 \]
So the circumference of the circle is approximately 14.13 miles. Therefore, the correct response is:
14.13 miles.