What does the CVC (1-1-1) Extended Doubling Rule help accomplish?

The CVC (1-1-1) Extended Doubling Rule is used primarily in the context of spelling, particularly when adding suffixes to base words. This rule specifies that when a one-syllable word ends with a single vowel followed by a single consonant, and the vowel is a short vowel sound, the final consonant should be doubled before adding a suffix that begins with a vowel.

For instance, in the word "run," the vowel 'u' is short, and following the single consonant 'n,' when adding the suffix -ing to form "running," the 'n' is doubled to retain the short vowel sound in the new form. This is essential for maintaining the pronunciation of the word and adhering to spelling conventions in English.

The other options represent concepts that do not accurately align with the purpose of the CVC Extended Doubling Rule; they either relate to different spelling patterns or rules, focusing on scenarios not governed by this particular rule. Understanding the specific application of the doubling rule helps with proper spelling practices and recognizes the impact of vowel sounds in word formation.