A rectangle has length 2x and width x. If each diagonal of the rectangle has len...【小站备考】

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A rectangle has length 2x and width x. If each diagonal of the rectangle has length d, what is the area of the rectangle, in terms of d?

A. $\frac{2}{5}d$

B. $\frac{5}{2}d$

C. $\frac{4}{25}d^{2}$

D. $\frac{2}{5}d^{2}$

E. $\frac{2}{3}d^{2}$

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