Answer:
userAge ( C )
Step-by-step explanation:
The option (C) is called a camel case and it is used in JavaScript language to to form JavaScript variable name more frequently. it is legal and a good style as well because it is used to different variable names as well.
The option ( B ) is known as pascal case and it can be used in various languages as well, it is used to form a more general variable name and it is not considered a good style in JavaScript language when a specific variable name is to be formed. it is not considered a very good style and it is not very much used like the camel case in JavaScript language.