Europe, Africa, and Asia because the Middle East is not a continent.
The answer is Variable
Explanation: A variable is a quantity or a number that can vary or take on different values.
The variable is normally represented as a letter, in this case this number is represented as a "A".
The result of the variable focus on the experiment or the study.
There are three types of variable: independent, dependent, and controlled.
Variables are the term of concepts in a study, such as the average age of a person upon acquiring his or her first job and the average salary he or she was paid for that job.
Answer: Option A
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A variable is a feature, number or quantity that can be measured or counted. A variable can also be called a data element. Examples of variables are person's age, category of gender, company revenue and expenditures, birth country, capital expenditure, grade class, eye color and vehicle type.
Salary is some amount of money paid to the employee from an employer in a company. So, here in the given situation, the average person’s income come under the term variable (can be counted).
