Final answer:
The feature that can automatically change all occurrences of a word or phrase with another word or phrase is Find and Replace.
Step-by-step explanation:
The feature that can automatically change all occurrences of a word or phrase with another word or phrase is C. Find and Replace. Find and Replace is a feature commonly found in word processing software and text editors. It allows you to search for a specific word or phrase and replace it with another word or phrase throughout the document.