Answer:
B) 15
Step-by-step explanation:
Its B because the formula for circumference is 2*PI*Radius. so you divide 47.1 by 6.28 (2*3.14 or 2*PI) to get the radius (which is 7.5) and because diameter is radius times 2 you multiply 7.5 times 2 to get the diameter of 15
