Complete the series.
4, 7, 12, 19, (...)

Correct option is B

The pattern in the series:
7 - 4 = 3
12 - 7 = 5
19 - 12 = 7
The differences are increasing by 2 each time. So, the next difference should be 9.
19 + 9 = 28
The correct answer is (b) 28.