In the following sentence, four words or phrases have been printed in bold. One bold part in the sentence is not acceptable in Standard English. Pick up that part and mark its number. If there are no errors in the bold parts, mark (5) i.e. No error as the answer.

The rapid teritorial /(A) gains made by the Taliban over the last two months should worry/(B) both the Afghan government and the regional/(C) powers who are invested in the country’s long-term stability./(D)