The correct answer is D. informal communication.
Rumours and gossips are types of informal communication. They are not part of the formal communication channels of an organization, and they are not usually sanctioned by management. They are often spread through word-of-mouth, and they can be difficult to control.
Downward communication is communication that flows from management to employees. It is often used to provide information about company policies, procedures, and goals.
Upward communication is communication that flows from employees to management. It is often used to provide feedback about company policies, procedures, and goals.
Horizontal communication is communication that flows between employees at the same level of the organization. It is often used to share information and coordinate work.