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/subtracting/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.)
(4,12,48)
(7,21,84)
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(4,12,48)
(7,21,84)

1st Number × 3 = 2nd Number
2nd Number × 4 = 3rd Number

4 × 3 = 12
12 × 4 = 48 

Set (7, 21, 84):
7 × 3 = 21
21 × 4 = 84 
Let's check all options:
Option (a): (5, 45, 180)  (Incorrect)​
5 × 3 = 15 $$\ne$$ 45​
Option (b): (15, 45, 170)  (Incorrect)​
15 × 3 = 45 
45 × 4 = 180 $$\ne$$ 170
Option (c): (15, 25, 180) (Incorrect)
15 × 3 = 45 $$\ne$$ 25
Option (d): (15, 45, 180)  (Correct)
15 × 3 = 45
45 × 4 = 180 (Pattern Follow)
Thus, the correct option is (d) (15, 45, 180)