Which option represents the best choice for a variable name to represent the average grade of students on an exam?

The choice of "averageGrade" as the variable name for representing the average grade of students on an exam is the best option for several reasons.

Firstly, it follows a common naming convention known as camelCase, where the first word is in lowercase and each subsequent word starts with an uppercase letter. This enhances readability and ensures that anyone reviewing the code can easily understand its purpose at a glance.

Additionally, "averageGrade" is descriptive and clearly conveys what the variable represents. Good variable names are important in programming because they make the code more intuitive and easier to maintain. Using full words rather than abbreviations helps reduce ambiguity; for instance, someone unfamiliar with the context might not understand that "avg" stands for "average," which could lead to confusion.

While other choices may be shorter or include unconventional characters, they do not provide the same level of clarity and professionalism that "averageGrade" does. A variable name should ideally communicate its content and purpose clearly, and "averageGrade" achieves that effectively.