Final answer:
In the A-B-C method, 'A' tasks are the highest priority tasks that should be attended to first due to their importance and urgency.
Step-by-step explanation:
In the A-B-C method of task management and prioritization, "A" tasks are considered the highest priority. The method suggests that tasks should be categorized into three groups: A, B, and C. The A tasks are the most critical ones that need immediate attention and should be done first. These are the tasks that are necessary and often have significant consequences if not completed. B tasks are important but not as urgent as A tasks, and C tasks are those that would be nice to complete but have the least impact if they are not done immediately.