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

The abbreviation that tells how the italicized noun clause is used is DO. The fourth option is correct.

The clause: "that young people will respond to a challenge" is a direct object. This clause cames right after the verb believe which is a transitive verb which requires a direct object to conve a compkete thought that makes sense.

The direc object is a noun phrase denoting a person or thing that is the recipient of the action of a transitive verb

what are the following?

services provided to people and organizations.answer