Respuesta :
Answer:
choice B is correct.
Step-by-step explanation:
The formula for r is given in the question statement,
r= C/Ï€ where C is the circumference.
If C= 16Ï€
r=16Ï€/2Ï€
r= 8
then the radius of the circle that has circumference 16Ï€ is 8 which is answer.