Let the function $f:[-7,0] \rightarrow R$ be continuous on $[-7,0]$ and differentiable on $(-7,0)$. If $f(-7)=-3$ and $f'(x) \leq 2$ for all $x \in (-7,0)$,then for all such functions $f$,$f(-1)+f(0)$ lies in the interval:

  • A
    $[-6, 20]$
  • B
    $(-\infty, 20]$
  • C
    $(-\infty, 11]$
  • D
    $[-3, 11]$

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