In Python, variable names must follow certain rules. They must start with a letter (a-z, A-Z) or an underscore (_), and they can be followed by letters, digits (0-9), or underscores. Variable names cannot contain spaces or start with a digit.
Given your options, the acceptable variable name is:
- thirdScore
The other options are not valid variable names because:
- 3rdScore: Starts with a digit.
- Third Score: Contains a space.
- 3rd Score: Contains a space and starts with a digit.