Final answer:
The principle 'Limit Work in Progress' addresses the need to narrow down tasks in progress to improve focus, reduce multitasking, and respect team members' time, thereby enhancing workflow efficiency.
Step-by-step explanation:
The guiding principle most concerned with judging what things to keep and reducing conflicting objectives while at the same time respecting people's time is Limit Work in Progress (C). Limiting Work in Progress is critical in lean management and agile methodologies because it helps teams focus on a smaller set of tasks, which reduces context switching and encourages completing tasks before starting new ones. This respect for people's time improves overall workflow and efficiency.
By limiting the amount of work being undertaken at any one time, teams are better able to concentrate on the current tasks, potentially improving quality and reducing the lead time necessary for task completion. Essentially, limiting work in progress ensures that teams do not overcommit and underdeliver, which can lead to burnout and inefficiency.