In a row of five buildings - A, B, C, D and E, which building is in the middle?

(I) Buildings D and B are at the two extreme ends of the row.

(II) Building E is to the right of building C.

If the data given in both statement I and II together are not sufficient to answer the question

From Statement I,

Two cases are possible:-

D, _, _, _, B

or

B, _, _, _, D

Nothing can be said about the building in the middle.
From Statement II,

Four cases are possible:-

C, E, _, _, _

or

_, C, E, _, _

Or

_, _, C, E, _

Or

_, _, _, C, E
Nothing is certain about the middle building, as in different cases it'll be different.

Hence, Option D is correct, as the data even in both statements I and II together are not sufficient to answer the question