Find the circumference of a circle with a radius of 7 units.

To find the circumference of a circle, one can use the formula ( C = 2\pi r ), where ( C ) is the circumference and ( r ) is the radius. In this case, the radius is given as 7 units.

Substituting the radius into the formula gives:

[ C = 2\pi(7) ]

Calculating this yields:

[ C = 14\pi ]

Thus, the circumference of the circle is ( 14\pi ) units. This means that the choice with ( 14\pi ) units accurately reflects the solution based on the radius provided. The other options present circumferences that result from incorrect calculations or misunderstandings of the formula. Overall, the reason ( 14\pi ) is valid stems directly from the application of the standard formula and the specific value of the radius involved in the calculation.