Algebra-1

The correct answer is A. Expression.

An expression is a mathematical phrase that combines numbers, variables, and operators (such as addition, subtraction, multiplication, and division) to represent or calculate the value of something. It can include constants, variables, and operations, but it does not necessarily assert equality like an equation does.

For example, the expression "3x + 5" represents a value that depends on the value of the variable x. When a specific value is assigned to x, the expression can be evaluated to determine the corresponding result.

Option B, Equation, ...