Concept:Identifying the part of speech of a word based on its function in a sentence.Explanation:The sentence is "There is no coffee - Would you like a cup of tea instead ?". The word "instead" is used here to suggest an alternative to coffee. Words that modify verbs, adjectives, or other adverbs, or express relation of circumstance or substitution, are adverbs. In this sentence, "instead" functions as an adverb, indicating a substitute for coffee.Let's look at the definitions of other options to be sure:A preposition connects a noun or pronoun to another word in the sentence (e.g., 'on', 'in', 'at').A conjunction connects words, phrases, or clauses (e.g., 'and', 'but', 'or').An adjective describes a noun or pronoun (e.g., 'big', 'happy', 'red').Since "instead" shows an alternative or substitute, it acts as an adverb.Answer:D. adverb