Answer:
D. 7x, 4y, and 1
Explanation:
An algebraic expression consists of a group of terms separated by operators, which are either plus signs or minus signs. A term is either a number by itself, which is called a constant, a variable by itself or a number multiplied by a variable. ... An expression differs from an equation because an expression is a group of terms without an equal sign. Identifying the terms of an expression is the first step to simplifying the expression.