If a real valued function $f:[-1,2] \rightarrow B$ defined by $f(x)=\left\{\begin{array}{l} 1-x, \quad \text { when }-1 \leq x \leq 1 \\ x-1, \quad \text { when } 1 < x \leq 2 \end{array}\right.$ is a surjection, then $\mathrm{B}=$

• A

  $[-1,2]$
• B

  $[-1,1]$
• Correct answer
  C

  $[0,2]$
• D

  $[0,1]$

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