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Answer:
D. Greg is not correct. The expression xyz has one term, xyz. It is the only term because there are no other parts separated by a plus or minus sign.
Explanation:
A term is a constant or a product.* Factors may include a constant and any number of variables raised to any powers. If the term is a monomial, it contains no parentheses, and the powers of any variables are non-negative integers.
The product xyz is one term. (choice D)
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* In general, a term is any designated expression, of any complexity. In Algebra courses, we're generally concerned with monomials, terms that can make up polynomials.