Final answer:
The phrase 'as is' functions as a prepositional phrase acting as a subject complement, which provides additional information about the subject in the sentence. The correct answer is D) Preposition.
Step-by-step explanation:
The grammatical name for 'as is' in the context of '(subject)+(be verb)+(subject complement [noun phrase])' is a prepositional phrase that functions as a subject complement. This type of structure can provide additional information about the subject or clarify the subject's state.
A common example might be 'The car is sold as is,' where 'as is' describes the condition of the car that is being sold.
Prepositional phrases often function as adverbials or subject complements and are a key element of sentence construction, assisting in the clarification and description of the subject.
A prepositional phrase is a group of words that begins with a preposition and ends with a noun or pronoun, known as the object of the preposition. These phrases function as modifiers, providing additional information about nouns, verbs, adjectives, or adverbs in a sentence.