Carbon , silicon and germanium have four valence elcectrons each . These are characterised by valence and conduction bands separated by energy band - gap respectively equal to ` (E_g)_(c) (E_g)_(si) ` and ` (E_g)_(Ge) `. Which of the following statements ture ?
A. `(E_(g))_(Si) lt(E_(g))_(Ge)lt(E_(g))_(C)`
B. `(E_(g))_(C)lt(E_(g))_(Ge)gt(E_(g))_(Si) `
C. `(E_(g))_(C)gt(E_(g))_(Si)gt(E_(g))_(Ge) `
D. `(E_(g))_(C)=(E_(g))_(Si)=(E_(g))_(Ge) `