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Question which-

2.4 Equivalent Expressions - Simplifying polynomials
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Which of the following expressions is equivalent to the sum of open parenthesis, r cubed, plus 5 r squared, plus 7, close parenthesis and open parenthesis, r squared, plus 8 r, plus 12, close parenthesis ?

A.

r to the fifth power, plus 13 r cubed, plus 19

B.

2 r cubed, plus 13 r squared, plus 19

C.

r cubed, plus 5 r squared, plus 7 r, plus 12

D.

r cubed, plus 6 r squared, plus 8 r, plus 19