The numbers are of the form, $$(n)^2,(n+1)^2,(n+2)^2$$, where $$(n+2)^2$$ is the number at the bottom.
Eg : $$2^2=4 , 3^2=9 , 4^2=16$$
and $$1^2=1 , 2^2=4 , 3^2=9$$
Similarly, $$3^2=9 , 4^2=16 , 5^2=25$$
=> Ans - (D)
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