Carbon, silicon, and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$, $(E_g)_{Si}$, and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?
- A$(E_g)_C > (E_g)_{Si}$
- B$(E_g)_C = (E_g)_{Si}$
- C$(E_g)_C < (E_g)_{Ge}$
- D$(E_g)_C < (E_g)_{Si}$
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