Final answer:
Valid Python variable names cannot start with a digit and should not contain spaces or special characters.
Step-by-step explanation:
Variable names in Python must adhere to certain rules. They can contain letters (both uppercase and lowercase), digits, and underscores, but cannot start with a digit. They should also not include any special characters or spaces.
Based on these rules, the valid variable names in the given options are:
- b. Feb1
- c. cityState
- e. Cube4
- f. CityState
- g. CityState
The variable names not allowed are:
- a. 4Cube - Starts with a digit
- d. Cannot be determined - Contains spaces