Answer:
b. horizontal communication
Explanation:
The communication is the process of passing the information from the sender to the receiver which involves the encoding, decoding, feedback, etc
The horizontal communication is the communication which communicate with the same level of the management i.e means passing the information within the organization of the same role and responsibilities
so according to the given scenario, the major short coming is of horizontal communication as they do not recognize the role of different level of management or different role and responsibilities