21, 55, 19, 45, 17, 35, ?choose the correct alternative which will complete the following series:

21, 55, 19, 45, 17, 35, ?choose the correct alternative which will co

1.	21, 55, 19, 45, 17, 35, ?choose the correct alternative which will complete the following series:
A.	12
B.	15
C.	14
D.	13
Answer» C. 14