15. Which one of the following words is written correctly? A. Guaranting

B. Fuedding

C. Copeing

D. Illustrating

D.

Guaranting is not a word (it even highlights it in red)

Fuedding is spelled incorrectly because they are only double lettered with an ing if a vowel is in between 2 non vowels

Copeing is wrong because it has an e and e's are supposed to be removed when adding an ing.