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Which of the following is a conjugate acid-base pair?

A

${ H }_{ 3 }P{ O }_{ 4 }$ and ${ H }_{ 2 }P{ { O }_{ 4 } }^{ - }$

B

${ H }_{ 3 }P{ O }_{ 3 }$ and ${ H }P{ { O }_{ 3 } }^{ -2 }$

C

${ H }_{ 2 }P{ { O }_{ 4 } }^{ - }$ and $P{ { O }_{ 4 } }^{ - 3}$

D

${ H }_{ 2 }P{ { O }_{ 3 } }^{ - }$ and $P{ { O }_{ 3} }^{ - 3}$

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