Select the set 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)
(13, 40, 115)
(5, 16, 43)

Logic: first number × 3 + 1 = second number ; first number × 9 - 2 = third number

As,

(13, 40, 115)

13 × 3 + 1 = 39+1=40 ; 13 × 9 - 2 = 117-2=115

and

(5, 16, 43)

5 × 3 + 1 =15+1= 16 ; 5 × 9 - 2 =45-2= 43

Now,

11 × 3 + 1 = 33+1=34 ; 11 × 9 - 2 = 99-2=97

6 × 3 + 1 = 18+1=19 ; 6 × 9 - 2 = 54-2=52

So, its not correct.

9 × 3 + 1 = 27+1=28 ; 9 × 9 - 2 = 81-2=79

So, its not correct.

7 × 3 + 1 = 22 ; 7 × 9 - 2 = 63-2=61

So, its not correct.

Thus, option A is correct.