Answer:
A, C, E
Step-by-step explanation:
If you choose A 0, you end up with a binomial, so A works.
If you choose B 5xy^3, it cancels out the existing -5xy^3 and you end up with only 1 term, so B does not work.
If you choose C 9x^2y, it adds to the 9x^2y and you have two terms. C works.
If you choose D 8y^4, you end up with 3 terms. D does not work.
If you choose E 4xy^3, it combines with -5xy^3, and you end up with two terms. E works.
Answer: A, C, E
