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

3 answers

1 - 3 are correct.

4 and 5 are incorrect.
what are 4 and 5
lol balls