\( \mathop { \lim } \limits_{x \to \pm \infty } \dfrac{{ \sqrt {4{x^2} + x} - 2x}}{{3x + 1}} \)
A.\(\dfrac{{ 5}}{2}\).
B.\(\dfrac{{ - 4}}{3}\).  
C.\(\dfrac{{ - 5}}{6}\).
D.\(\dfrac{{ 2}}{3}\).

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