\textbf{137-} The two lines $y = -2x$ and $y = 2x + 4$ are the asymptotes of a hyperbola, and $M\!\left(\dfrac{3}{2},\, 5\right)$ is one of its points. The distance between the two foci of this hyperbola is:
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(1) $2\sqrt{3}$ \hfill (2) $2\sqrt{5}$ \hfill (3) $4\sqrt{3}$ \hfill (4) $4\sqrt{5}$
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