Among five persons D, E, F, G and H each of whom having different height, who is the second tallest ?

I. D is taller than only G and E . F is not the tallest.

II. H is taller than F. G is taller than E but shorter than D.

Statement I:  D is taller than only G and E . F is not the tallest.

H, > F, > D, > G/E, > E/G.

Here, F is the second tallest.

 Statement I alone are sufficient

Statement I:  H is taller than F. G is taller than E but shorter than D.

H, > F

D, > G, > F.

Statement II alone are not sufficient.

Thus, if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.

Hence, the correct answer is "Option 1".