pyq/2013/csat/50

Examine the following three figures, in which the numbers follow a specific pattern:

![50](https://d1h9q04lwcgmfs.cloudfront.net//CSAT_2013_Q50_721c8d5597.png)

What is the missing number (?) in Figure 3?

(A) 7

(B) 16

(C) 21

(D) 28