Analogy - Verbal and Reasoning

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

In this pyramid number if: 11 22 31 : 12 21 32 :: 9 12 21 : ?

A 2 7 14

B 8 13 20

C 6 15 18

D 10 23 30

ANS:B - 8 13 20

Explanation: No answer description is available.