【单选题】

The author mentioned "a string of crimes" in paragraph 2 to show that ______.
A．(A) Crime is becoming more and more rampant and nasty in Britain.

B．(B) Crime rate is on the rise in Britain.
C．(C) The government has done little to crack down on crimes.
D．(D) Harsh sentence and prisons are not effective in alleviating crimes.