Analogy - Verbal and Reasoning

Directions to SolveIn each of the following questions find out the alternative which will replace the question mark.
Q1:

14 : 9 :: 26 : ?

A 12

B 13

C 31

D 15

ANS:D - 15

Explanation: 14 = (2 x 9 - 4) 26 = (2 x 15 - 4) ? = 15