Answer: There's no prepositional phrase because there is no preposition
The committee;. Subject
elected;. Verb
George;. Object
chairman;. Object complement
Step-by-step explanation:
The committee is the noun that precedes the verb, hence, it's the subject.The verb is "elected" because it shows the action done . "George" is the object because he is the noun that comes after the verb."Chairman" refers to the position George was elected into.