Final answer:
The correct option to replace all instances of text using the Find and Replace feature is 'Global'. This option allows for a batch replacement of the specified text throughout the entire document.
Step-by-step explanation:
When using the Find and Replace feature, the options for finding and replacing text include finding the next instance, replacing the next instance, or using the Replace All option to replace all instances. The correct answer to fill in the blank is b) Global.
In the context of Find and Replace, the Global option refers to applying the replacement operation to all instances of the specified text within the document or selected text area. This feature saves time by updating multiple occurrences in one action, rather than requiring the user to manually find and replace each instance.