The answer here is 'Have' - making Option B) the correct answer. This is because the noun 'police' is always treated as a collective noun, and thus the plural form of the verb i.e 'Have' must be used and not singular forms like is, or has; and were is incorrect in terms of tense. All other answers are inappropriate.
police has the arrest the thief
police have arrested the thief
B
(B)
२
b
B
B
police has arrested the thief.