Which of the following sentence has a transitive verb?

A transitive verb is one that is used with an object: a noun, phrase, or pronoun that refers to the person or thing that is affected by the action of the verb. In option 2, the verb 'maintained' is being followed by the object 'product quality. Hence, it is the most appropriate choice.An intransitive verb does not have an object. For eg.- The trees were moving in the breeze. I work for a large firm in Paris. Pete always sings in the bath.