The factors of pqr + qr² - pr² - r³ should be

1.	The factors of pqr + qr² - pr² - r³ should be
A.	(p + r)(q - r)
B.	(p - r)(q + r)
C.	r(p + r)(q - r)
D.	p(q + r)(q - r)
Answer» D. p(q + r)(q - r)

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