Which rule states that if a word ends in consonant-y, the 'y' is changed to 'i'?

The rule that specifies changing a 'y' to 'i' when a word ends in consonant-y is known as the Y Spelling Rule. This phonetic guideline applies primarily to certain words where transforming the 'y' to an 'i' is necessary when adding suffixes that begin with vowels, such as -ed or -ly. This transformation is important for maintaining the correct spelling of words and ensuring proper pronunciation.

For example, the word "happy" becomes "happily" when the suffix is added. The rule helps learners understand how to handle words correctly when inflectional endings are applied, fostering accuracy in spelling.

The other options refer to different spelling conventions or rules that do not specifically address the changing of 'y' to 'i'. Knowing this distinction helps clarify the specific function of the Y Spelling Rule in the context of English spelling.