Match each graph to its equation.
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A. $\displaystyle \frac{y^2}{4}-x^2=1$
B. $\displaystyle 4x^2-y^2=1$
C. $\displaystyle y^2-4x^2=1$
D. $\displaystyle x^2-\frac{y^2}{4}=1$
E. $\displaystyle \frac{y^2}{4}-\frac{x^2}{16}=1$
F. $\displaystyle x^2-4y^2=1$