The integrating factor of the differential equation $(2x + 3y^2) dy = y dx$ $(y > 0)$ is

  • A
    $-\frac{1}{y^2}$
  • B
    $\frac{1}{y^2}$
  • C
    $e^{\frac{1}{y}}$
  • D
    $\frac{1}{x}$

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