Tenses

Sentence: The police ........... the thief.

• 'Police' is treated as a plural noun in English, so it takes a plural verb.

• The sentence implies a completed action in the past, so the simple past tense is required.

• 'Arrested' is the correct past form of the verb 'arrest'.

Thus, the correct sentence is: The police arrested the thief.

The other options are incorrect because:

• A. arrest - Simple present tense; does not fit without a time reference like 'usually' or 'often'.

• C. arresting - Present participle; cannot stand alone as the main verb.

• D. has arrest - Grammatically incorrect; correct form would be 'has arrested'.