lf Rolle's theorem holds for the function $f(x) =2x^3 + bx^2 + cx, x \in [-1, 1],$  at the point $x = \frac {1}{2},$ then $2b+ c$ equals

  • [JEE MAIN 2015]
  • A

    $-3$

  • B

    $-1$

  • C

    $2$

  • D

    $1$

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