Respuesta :
Answer: B. -ly (greatly)
The way in which you can change the adjective "great" into an adverb is by adding the suffix "-ly." This is a suffix commonly used with adverbs, and it would leave you with the word "greatly." An adverb is a word that tells us more information about the verb, such as "when," "why," "how," "how much" and "for how long."