यदि $y = [(x+1)(2x+1)(3x+1) \dots (nx+1)]^4$, जहाँ $n \in N$ और $x = 0$ पर $\frac{dy}{dx}$ का मान $2k$ है, तो $k$ का मान है

  • A
    $\frac{n(n+1)}{2}$
  • B
    $n(n+1)$
  • C
    $2n(n+1)$
  • D
    $4n(n+1)$

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