Which of the following is a monomial?

Answer:
I believe the correct answer is C.
I know D. is incorrect, because that would be a trinomial or a polynomial.
I think A and B, could be possible answers because they don't have more than one term though.
Step-by-step explanation:
A Monomial consists of one term.
A Binomial consists of two terms. (Bi-means two)
A Trinomial consists of three terms. (Tri-means three)
A Polynomial consists of more than two terms. (Poly-means many)
I hope this helps!! Have a great, blessed day!!