Which agency is prohibited from engaging in recruitment and placement for overseas employment?

The agency that is prohibited from engaging in recruitment and placement for overseas employment is the sales agencies of airline companies. This prohibition is in place because airline sales agencies are primarily involved in selling airline tickets and managing travel logistics, rather than serving as recruitment or placement services for employment abroad. Their focus is not aligned with job matching or labor supply, which is essential for recruitment agencies that specifically cater to employment needs.

Other types of agencies, such as travel agencies, job placement organizations, and private employment agencies, are often involved in various aspects of recruitment and placement for overseas work, with some offering specific services aligned with employment opportunities abroad. Thus, the role of airline sales agencies distinctly differentiates them from the other types of organizations mentioned, making them the correct choice in this context.