which is the prefix in disappointedly?\no dis-\no appoint\no -ed\no -ly

Brief Explanations:

A prefix is a word - part added before a root word. In "disappointedly", "dis -" is added before the root "appoint", making it a prefix. The "-ed" is a suffix indicating past participle and "-ly" is a suffix making it an adverb. "Appoint" is the root word.

Answer:

A. dis-