Select the abbreviation that tells how the italicized noun clause is used.

S-subject, DO-direct object, SC-subject complement, OP-object of preposition

(What I wanted to do) was to finish my work.
S
The valedictory prize will be awarded to (whoever has the highest academic rating.)
OP
The chairman heard (what was said about the program.)
DO
A good night's sleep is (what I need most.)
Do
(What I had been hoping for) was a scholarship.
SC

1 - 3 are correct.

4 and 5 are incorrect.

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what are 4 and 5

The abbreviation that tells how the italicized noun clause is used in the sentence "(What I had been hoping for) was a scholarship." is SC, which stands for subject complement.

To determine the answer, first identify the italicized noun clause, which is "What I had been hoping for." Then consider how this noun clause is functioning in the sentence. In this case, it is used to further describe or identify the subject "I." It serves as a complement to the subject, explaining what the subject "I" had been hoping for. Therefore, the abbreviation SC is appropriate.