Question

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

S-subject, DO-direct object, SC-subject complement, OP-object of preposition
I am optimistic enough to believe that young people will respond to a challenge.

S
OP
SC
DO

Answer 1

that young people will respond to a challenge is italicized

Answer 2

@rugerg Hmm, i would so with SC as S-subject: optimistic and C-response to challenge