Final answer:
The linking verb is 'remain' and the predicate adjective is 'undecided'.
Step-by-step explanation:
The linking verb in the sentence is remain, and the predicate adjective is undecided. The linking verb 'remain' connects the subject 'the jurors' to the predicate adjective 'undecided', which describes the state of the jurors.
Learn more about Linking verbs and predicate nouns/adjectives