Please Help!!!
Simplify -3 p^3 + 5 p + (-2 p^2 ) + (-4) - 12 p + 5 - (-8 p^3 ). Select the answer in descending powers of p .

A- 1 - 7 p - 2 p^2 + 5 p^3
B- p^3 - 2 p^2 - 7 p + 1
C- 1 + 7 p + 2 p^2 - 5 p^3
D- -5 p^3 + 2 p^2 + 7 p + 1