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1. A: Constant
2. C: Term
3. B: Coefficient
4. D: Variable

Explanation:
A constant is a value that does not change, even if the variable changes. For example, in x^2+3x+9, 9 is the constant because it doesn’t matter what value x is: 9 will always be 9.
A term is the whole group of numbers and/or variables, separated by signs of multiplication, division, addition, and subtraction. In x^2+3x+9, x^2 is a term and 3x and 9 are also individual terms.
A coefficient is the constant in front of a variable. In the term 3x, 3 is the coefficient because it is in front of the variable, x.
A variable is often a letter that represents a number. In the term 3x, x is the variable.