Respuesta :
When adding a suffix that begins with a vowel to a root word that ends with a consonant, double the consonant before adding the suffix. Reoccurring is the exception to spelling rules. To change the word reoccur to reoccurring, simply add the suffix -ring.
Answer:
A. When adding a suffix that begins with a vowel to a root word that ends with a consonant, double the consonant before adding the suffix.
Explanation:
You can see the suffix begins with a vowel (ing). Also the last letter of the of the root word is the letter you double in order to get "Reoccurring."