Factor by substitution.21( 3 - p)2 - 13( 3 - p) + 2

A. ( 19 - 7p)( 8 - 3p)
B. ( 19 - 7p)( 8 + 3p)
C. ( 19 + 7p)( 8 + 3p)
D. ( 19 + 7p)( 8 - 3p)


Answer: A

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