You need to write your mobile number, while home address is . . . . . . . . A. optionals B. optional C. options D. option

The correct answer is optional.

• Optional means that something is not required, but it is possible to do it if you want to.
• Options is the plural form of option. It means a choice between two or more things.
• Optionals is not a word. It is a misspelling of options.
• Option is a noun that means a choice between two or more things.

In the context of the question, “You need to write your mobile number, while home address is . . . . . . . .”, the answer is optional. This is because you are not required to provide your home address, but you can do so if you want to.