Final answer:
An open door policy is a business practice that encourages employees to freely communicate with their managers without any barriers.
Step-by-step explanation:
The correct answer is B. Open door policy.
An open door policy is a business practice that encourages employees to freely communicate with their managers without any barriers. It allows employees to discuss work-related issues, share ideas, and seek guidance or feedback from their superiors. This policy promotes transparency, fosters a positive work culture, and helps in building better relationships between employees and managers.