What comes in this sequence 7, 14, 10, 12, 14, 9, ….?

A) 19

B) 13

C) 16

D) 15

Remember that When series is increasing as well decreasing, Make two series 

First Series                     Second Series  

7+3 = 10                              14-2 = 12

10 +4 = 14                           12-3= 9

14 +5 =19                             

so answer is 19.