If pq + qr + rp = 0, then what is the va...

If `pq + qr + rp = 0`, then what is the value of `(p^(2))/(p^(2) - qr) + (q^(2))/(q^(2) - rp) + (r^(2))/(r^(2) - pq)` ?

A

0

B

1

C

`-1`

D

3

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