If $\alpha, \beta$ are the roots of the equation $x^2+bx+c=0$ satisfying the conditions $\alpha+\beta=5$ and $\alpha^3+\beta^3=60$,then $3c+2=$ (in $b$)

  • A
    $2$
  • B
    $3$
  • C
    $-3$
  • D
    $-2$

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