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(3p^(2)qr^(3)) xx (- 4p^(3)q^(2)r^(2))xx...

`(3p^(2)qr^(3)) xx (- 4p^(3)q^(2)r^(2))xx (7pq^(2)r)` is equal to

A

`84 p^(6)q^(6)r^(6)`

B

`-84 p^(6)q^(6)r^(6)`

C

`- 84 p^(6)q^(5)r^(6)`

D

`84p^(6)q^(5)r^(6)`

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