An Agricultural Labourer (Option A) belongs to the unorganized sector.
Explanation:
- The unorganized sector refers to workers who are employed in informal jobs and do not have fixed wages, job security, or social benefits.
- Agricultural labourers are typically part of this sector as they work on farms without formal contracts or benefits.
- Bank Managers (Option B), Gazetted Officers (Option C), and Soldiers (Option D) are employed in the organized sector, which provides regular wages, security, and benefits.