What Was One of the Reasons for Leaving Cited by Those

What was one of the reasons for leaving cited by those supporting Britain's exit from the European Union?

A) They wanted the British Parliament to be able to control its trade relationships again.
B) They did not want to accept Serbia as a member.
C) They wanted to draw closer political ties with the United States,which other states of the EU were refusing to do.
D) They wanted to draw closer political ties with Russia,which other states of the EU were refusing to do.