Select the option in which the numbers are related in the same way as are the numbers in the given sets.
(4, 9, 16)
(81, 100, 121)

The square of consecutive numbers is done here.

(4, 9, 16)

(4, 9, 16) ==> $$(2^2,\ 3^2,4^2)$$ 

(81, 100, 121)

(81, 100, 121) ==> $$(9^2,\ 10^2, 11^2)$$

Option (a) (16, 36, 25)

This is not the correct answer. Because the square of the consecutive numbers is not available here.

Option (b) (25, 49, 81)

This is not the correct answer. Because the square of the consecutive numbers is not available here.

Option (c) (9, 16, 36)

This is not the correct answer. Because the square of the consecutive numbers is not available here.

Option (d) (36, 49, 64) ==> $$(6^2,\ 7^2,\ 8^2)$$

This is the correct answer. Because the required logic is available here.