Final answer:
An algebraic expression is a mathematical expression that contains variables, numbers, and operations. Option C) 03−a is an example of an algebraic expression as it contains a variable and a subtraction operation.
Step-by-step explanation:
An algebraic expression is a mathematical expression that contains variables, numbers, and operations such as addition, subtraction, multiplication, and division.
A) O4(3+8) is not an algebraic expression because there are no variables present.
B) 182 is not an algebraic expression because it is a single number and does not contain any variables or operations.
C) 03−a is an algebraic expression because it contains a variable ('a') and a subtraction operation (-).
D) 21.4 is not an algebraic expression because it is a single number and does not contain any variables or operations.
Therefore, the correct answer is C) 03−a as it is the only option that meets the criteria of an algebraic expression.