Use the unbalanced equation below to answer the question that follows:
Al+O2 →Al2O3

Which of the following sets of coefficients would correctly balance the equation and why? (3b DOK 3)

A.
2, 2, 2; because you must use the same coefficient for each substance

B.
2, 3, 2; because you must have the same number of atoms on each side of the equation

C.
4, 3, 2; because you may have the same number of atoms on each side of the equation

D.
4, 3, 2; because you must have the same number of compounds on each side of the equation