The prefix in disappointedly is dis- Option(a) is correct.
A Prefix is a join which is set before the stem of a word. Adding it to the start of single word transforms it into another word. For instance, when the prefix un-is added to the word blissful, it makes the word troubled.
Prefixes, as different joins, can be either inflectional, making another type of the word with a similar fundamental importance and same lexical classification (however assuming an alternate part in the sentence), or derivational, making another word with a new semantic significance and once in a while likewise an alternate lexical category. Prefixes, similar to any remaining fastens, are generally bound morphemes.
In German, subsidiaries framed with prefixes might be characterized in two classifications: those utilized with nouns and descriptors, and those utilized with verbs. For subsidiary nouns and modifiers, just two useful prefixes are for the most part addable to any considerable or descriptive word starting around 1970: un-, which communicates refutation from and and that signifies "unique, crude" in nouns, and has a decided capability in modifiers.
Therefore Option(a) is correct.
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