Answer: The complement indicated by the bolded words "tired and exhilarated" is predicative adjective.
Step-by-step explanation: A predicative adjective is an adjective or adjective phrase that modifies and provides additional information about the subject of a sentence. However, a predicative adjective can only be present if there is a linking verb that connects it to the subject. In the sentence "After the race, the runners felt tired and exhilarated", "tired and exhilarated" is a predicative adjective because, besides being an adjective phrase, it is describing and offering additional information about the subject of the sentence, that is to say "the runners". Moreover, the linking verb that establishes a relationship between the subject and the predicative adjective is "felt".