To add a commonly confused word to the dictionary, which option should be selected?

Choosing to "ADD TO DICTIONARY" is the correct action when you encounter a word that is often confused with another and you want to make sure that it's recognized in your text documents. This option allows you to permanently include the word in your custom dictionary file, which is particularly useful for specialized terminology, names, or regional spellings that spell checkers might not acknowledge by default.

By adding the word to the dictionary, you ensure that the spelling is validated during future typing sessions, reducing interruptions and the potential for repeated errors. This is especially helpful in maintaining the fluidity of your writing without being hindered by repeated flagging of the word as a spelling error.

The other choices represent actions that do not facilitate the inclusion of a word into your dictionary for future use. Ignoring all will dismiss the word for the current session but won't resolve the issue in future documents. Removing a word from the dictionary will delete it, making it unavailable for recognition later. Replacing a word suggests substituting it for another term, which is also not aimed at adding to your personal dictionary. Thus, "ADD TO DICTIONARY" is the most effective option for enhancing your word recognition in word processing applications.