Find the equation of the circumference of a wheel if the radius is 2.5.

A.
C
=
3.14
⋅
2.5
⋅
2.5

B.
C
=
2
+
3.14
+
2.5

C.
C
=
3.14
+
2.5
+
2.5

D.
C
=
2
⋅
3.14
⋅
2.5