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.

Biden's administration has sought/(A) cooperation with U.S. opponents and compititors/(B) on climate despite sometimes hostile/(C) relations on other matters./(D)