Select the abbreviation that tells how the italicized noun clause is used. s-subject, do-direct object, sc-subject complement, op-object of preposition a good night's sleep is what i need most.

although the noun clause is not given in italics, it is easy to find it since the noun clause is a word used as a noun, such as who, what, whatever, whoever and etc. the noun clause in the sentence is what i need most. it is also a subject complement which explains the subject - a good night's sleep. the correct answer is sc.

demonstrative would be the answer.