Active and Passive are the two voices of a transitive verb, which is a verb with an object. The verb is considered to be in the Active Voice when the subject of the verb also carries out the action. The verb is considered to be in the passive voice when the verb's subject receives the action it refers to. The verb's voice indicates whether or not the subject of the sentence is the one carrying out the activity that the verb denotes. It is necessary to identify the (S+V+O) Subject, Verb, and Object of the active sentence in order to convert it to the passive voice. Then, switch the positions of the object and subject such that the active sentence's object becomes the passive sentence's subject; hence in the given sentence, the subject 'police' becomes the object in the passive form and the object 'thief' becomes the subject in the passive form. The verb changes into past participle. The passive verb is then followed by the preposition 'by' or 'with' and then the doer 'Police' is mentioned. Therefore, the correct answer is option B.