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.)

(13, 39 , 6)

(9, 18, 4)

(12, 48, 8)

(13, 39 , 6)

(9, 18, 4)

The logic followed here is :

(Ist number × Third) ÷2 = second number 

As

(13 × 6) ÷2 = 39

(9 × 4 ) ÷2 = 18

Similarly option 1

(12 × 8 ) ÷ 2 = 48