Which of the following is most likely the next step in the series?

B is the answer

Step-by-step explanation:

Cylinder Surface Area = (2 • π • r²) + (2 • π • r • height)

Cylinder Surface Area = 2 * PI * 12^2 + 2 * PI * 12 * 16

Cylinder Surface Area = 904.7786842339 +  1,206.3715789785
Cylinder Surface Area = 2,111.1502632124 square feet
Which equals
672 PI square feet

The answer is second from the top.
Source:
http://www.1728.org/diamform.htm