Arrange the following in the increasing order of their energy gap between their conduction and valence bands:

(A) Si
(B) C (diamond)
(C) Ge
(D) Sn

Choose the correct answer from the options given below:

(D), (C), (A), (B)

The correct answer is Option (1) → (D), (C), (A), (B)

Energy gap order for given elements:

Sn (metal) < Ge (semiconductor) < Si (semiconductor) < C (diamond, insulator)

Increasing order of energy gap:

(D) Sn < (C) Ge < (A) Si < (B) C