Carbon, silicon, and germanium have four valence electrons each. These are characterized by valence and conduction bands. Seperated by energy band gap respectively equal to $(Eg)_e,(Eg)_{si}$ and $(Eg)_{Ge}$. Which of the following statement is true ?
$\begin{array}{1 1} (Eg)_{si} < (Eg)_{Ge} < (Eg)_c \\ (Eg)_{si} < (Eg)_{Ge} < (Eg)_{si} \\ (Eg)_{c} > (Eg)_{Si} > (Eg)_{Ge} \\ (Eg)_{c} = (Eg)_{Si} < (Eg)_{Ge} \end{array}$