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triangle ABC is similar to triangle PQR and AB: PQ = 2: 3. AD is the median to the side BC in triangle ABC and PS is the median to the side QR in triangle PQR. What is the value of `(BD//QS)^(2)`?

A

`3//5`

B

`4//9`

C

`2//3`

D

`4//7`

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