Final answer:
The major challenge that managers face as a result of the interrupt-driven day is maintaining control of decision making.
Step-by-step explanation:
The major challenge that managers face as a result of the "interrupt-driven day" is maintaining control of decision making. With interruptions and distractions throughout the day, managers may struggle to stay focused on making informed and efficient decisions. This can lead to delays, inconsistencies, and a lack of clear direction for the team.