Which type of areas should be worn while appearing for an interview? 

The correct option is: formal.

Key Points

• Formal attire is the most appropriate choice when appearing for an interview.
• Formal clothing conveys professionalism, respect, and seriousness about the opportunity.
• It shows that the individual values the interview and is presenting themselves in the best possible way to a potential employer.
• Casual attire is generally too informal for an interview.
• Wearing casual clothes can give the impression of being unprepared or lacking seriousness about the position, which may negatively affect the interviewer's perception of the candidate.
• Traditional attire may be appropriate in certain cultural or regional contexts, but for most professional interviews, formal attire is the preferred choice unless the industry or company specifically encourages or allows for traditional clothing.

Hence, the correct answer is: formal.