Final answer:
The correct method to use when you don't need to work with all the values in a dictionary is the keys() method. It provides a way to access and iterate through just the keys of a dictionary.
Step-by-step explanation:
The method that is useful when you don't need to work with all of the values in a dictionary is the keys() method. This method allows you to view, access, and iterate through the keys of a dictionary, without needing to work directly with the values. For example, if you have a dictionary named doors and you're only interested in the keys, you can use doors.keys() to get a list-like view of just the keys. The values() method, on the other hand, would provide a view of the values, and the del() function is used to delete items from a dictionary, not to access keys or values selectively. Therefore, keys() is the correct method to use when you need to work with keys independently of their associated values in a dictionary.