What method would you use to clear all items in a dictionary?

The method to clear all items in a dictionary is clearly defined in Python as clear(). When you call dictionary_name.clear(), it removes all the key-value pairs from the dictionary, leaving it empty.

This method is specifically designed for use with dictionary objects and directly reflects the intended action of clearing the data within the dictionary. It modifies the dictionary in place, which means that after using clear(), the original dictionary object will be empty but still exists in memory.

The other options presented do not correspond to valid methods used for dictionaries in Python. For instance, remove_all() is not a method associated with dictionary operations, and neither delete() nor empty() are recognized methods in Python's dictionary implementation. Understanding the functionality and the correct method to use is key to effective programming with dictionaries in Python.