Which of the following naming conventions is suitable for variable names?

• A. upper_case
• B. snakeCase
• C. Pascal-Case
• D. None of the above

Answer: (B)

The choice of naming conventions for variable names is critical in programming for readability and maintainability. The naming convention known as "snake_case" is particularly suitable for variable names in Python and is widely adopted in the Python community.

In this convention, words are written in lowercase and are separated by underscores (_), such as my_variable_name. This style enhances clarity, especially when variable names are composed of multiple words, making it easy to read and understand their purpose at a glance. Python's PEP 8 style guide advocates for using snake_case for variable names, encouraging programmers to use this naming style to ensure consistency across the codebase.

The other options present different naming conventions that may not align with Python's style recommendations. For example, "upper_case" suggests using all uppercase letters, which is typically reserved for constants in Python. "Pascal-Case" uses capital letters for each word without underscores, which is commonly used for class names in Python rather than variable names. Consequently, snake_case emerges as the most appropriate choice for defining variable names within Python programming.