The part of the speech that is the word margin as it is used in the sentence is the outside limit or edge and is an adjective. The correct option is D. and 3.
The part of speech is a category of grammar. There are eight types of parts of speech. They are nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunction, and interjection.
Adjectives are the words that describe the quality of any object. Like she is very beautiful. Beautiful is an adjective.
Thus, options D. adjective, and 3. the outside limit or edge are correct.
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