Step 1: Understanding the Concept:
This question requires choosing the correct verb form. The options represent different tenses and forms. A standalone sentence requires a finite verb.
Step 2: Detailed Explanation:
Let's analyze the options for a complete sentence:
- (A) arrest: "The police arrest the thief." This is simple present. Grammatically correct, as 'police' is often treated as a plural noun.
- (B) arrested: "The police arrested the thief." This is simple past. Grammatically correct.
- (C) arresting: This is the present participle. By itself, it cannot form a complete sentence. It requires an auxiliary verb (e.g., "The police are arresting the thief.").
- (D) has arrest: Grammatically incorrect. It should be "has arrested", and 'police' usually takes a plural verb ('have').
Step 3: Final Answer:
The correct option, is (B).