B;
A monomial is a single term;
All the others apart from option B have two different terms being added together.
An expression which has no addition or subtraction can be classified as a monomial if I'm not mistaken.
Answer:
I believe it is D at least I hope so
Yes that is the correct answer
3² + 7 - y² - 5 - 2y² -1
= -3y² + 9 + 1 = -3y² + 10