Final answer:
The best course of action is to give the customer more time to decide and offer assistance if needed.
Step-by-step explanation:
If a customer is staring blankly at the menu, the best course of action is to give them more time to decide and offer assistance if needed (option b). It's important to be patient and understanding with customers who may be indecisive or unsure about what they want. By offering assistance, such as providing recommendations or answering any questions they may have, you can help the customer make a decision.