Select the set in which the numbers are related in the same way as are the numbers of the following set.
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits.)

(12, 51, 5)

(8, 30, 2)

(11, 51, 6)

(12, 51, 5)

(8, 30, 2)

The logic followed here is :

(Ist number+ IIIrd number) × 3  = second number

as

(12 + 5) × 3  = 51

(8 + 2) × 3   = 30

Same as (11, 51, 6)

(11 +  ) × 3   = 51