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

Question: 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

Answer: Option B

Explanation:

No answer description available for this question.