Select the option in which the numbers are related in the same way as are the numbers of the following sets.

NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding /deleting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(7, 1, 3)
(12, 2, 5)

(30, 8, 11)

(7, 1, 3)
(12, 2, 5)

The logic followed here is :

(Ist number - second number) ÷ 2 = IIIrd number

as

(7 - 1) ÷ 2 = 3

(12 - 2) ÷ 2 = 5

same as in (30, 8, 11)

(30 - 8) ÷ 2 = 11