Which of the following statements best describes why the given expression is not simplified?
8a(a^2-3a)+3
A
Like terms have not been combined.
B
One or more monomials have not been distributed.
C
One or more monomials have not been multiplied.
D
Both statements A and C are reasons that this expression is not simplified.
8a(a^2-3a)+3
A
B
C
D