Final answer:
The closed question is 'Can you call her today?' as it requires a simple yes or no answer. In a business context, organizing information, like productivity metrics, is crucial for analysis and decision-making.
Step-by-step explanation:
The example of a closed question from the options provided is d) Can you call her today? This is because it requires a simple yes or no answer, unlike the other options which are open-ended questions inviting explanation or discussion. When exploring questions in a business context, particularly those related to improving productivity or reducing costs, it is beneficial to organize information in a clear format like a table to assess productivity metrics, proposed solutions, and their potential impact.