Carbon,Silicon,and Germanium have four valence electrons each. These are characterized by valence and conduction bands separated by energy band gaps respectively equal to $(E_g)_C, (E_g)_{Si},$ and $(E_g)_{Ge}$. Which of the following statements is true?

• A
  $(E_g)_{Si} < (E_g)_{Ge} < (E_g)_C$
• B
  $(E_g)_C < (E_g)_{Ge} > (E_g)_{Si}$
• C
  $(E_g)_C > (E_g)_{Si} > (E_g)_{Ge}$
• D
  $(E_g)_C = (E_g)_{Si} = (E_g)_{Ge}$