If $\mathrm{f}\left(\mathrm{x}\right)=\left\{\begin{array}{ll}\mathrm{x}+1;& \mathrm{x}>1\\ 0\mathrm{ };& \mathrm{x}=1\\ 7-3\mathrm{x};& \mathrm{x}<1\end{array}\right.$ then ${\mathrm{f}}^{\mathrm{\prime }}\left(0\right)$ equals to

• A

  $-1$
• B

  $-\mathrm{ }2$
• Correct answer
  C

  $-\mathrm{ }3$
• D

  $-\mathrm{ }4$

Hence, the correct answer is option: 'C'.