The last answer option presents an active sentence. This option states that: Olympic athletes are characterized as having a strong work ethic.
The subject of a sentence is the word that indicates the element that is promoting or undergoing the action indicated by the verb of the sentence. When the subject promotes the action, this sentence is active. When the subject is undergoing the action of the verb, the sentence is passive.
More information about an active sentence in the link:
https://brainly.com/question/26432700