If the area bounded by $y = x^3 + ax$ (where $a > 0$), the $x$-axis and the lines $x = -2$ and $x = 1$ is $\frac{37}{4}$ square units, then:

  • A
    $a = 4$
  • B
    $a = 2$
  • C
    $a = 10$
  • D
    $a = 20$

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