Final answer:
You should place the napkin on your lap as soon as you sit down at a dinner party, which is True. Being quick and attentive with your napkin placement demonstrates good dining etiquette.
Step-by-step explanation:
The subject of the question concerns dining etiquette, particularly relating to the appropriate time to place your napkin on your lap at a dinner party. The correct answer is True. You should place your napkin on your lap almost immediately upon sitting down at the table. This is widely considered polite behavior and shows that you are ready to partake in the meal while also being prepared for any incidental spills or messes.
As for the waiting on hold during a telephone call, while not directly related to the initial question, it's generally polite to remain patient when you are on hold. There is no exact time limit for how long you should wait, but if the wait is excessively long, it may be acceptable to hang up and try the call again later or seek alternative methods of contact.