Which kind of complement are the underlined words?

the winner of the first place ribbon for science is robin serranos!

a.
predicate nominative

b.
direct object

c.
predicate adjective

d.
indirect object

Unity in a paragraph means: my writing persuades my readers to agree with the argument i am presenting. the paragraph discusses and supports one thought throughout the entire paragraph. all sentences in a paragraph are the same length and structure. the first sentence and the last sentence echo the exact same thought.