Explanation:

- Have you appointed for a job in this company?

The word "appointed" means being officially assigned to a position or role, typically by someone in authority. It doesn't fit here because the question asks about the act of seeking a position, not receiving one.

- Have you supplied for a job in this company?

"Supplied" generally means providing something needed or wanted. This option is incorrect, as it does not align with the context of job application.

- Have you approved for a job in this company?

"Approved" involves giving consent or agreeing to something. It doesn’t fit the context of seeking employment as it’s more about accepting or authorizing.

- Have you applied for a job in this company?

"Applied" is the correct choice. It refers to the act of making a formal request or application for a job, perfectly fitting the question context.