If x ^(2) + y ^(2) + z ^(2) = xy + yz + ...

If `x ^(2) + y ^(2) + z ^(2) = xy + yz + zx,` then the value of `(3x ^(4) + 7y ^(4) + 5z ^(4))/( 5x ^(2) y ^(2) + 7y ^(2) z ^(3) + 3z ^(3) x ^(2))` is

A

2

B

1

C

0

D

`-1`

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The correct Answer is:

B

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