One of the important functions of the United Nations is to decide if they should recognize the legitimacy of a new government that assumed power through violence.

A. to decide if they should recognize the legitimacy of a new government that
B. to decide whether to recognize the legitimacy of a new government that
C. deciding whether to recognize a new government to be legitimate that
D. to decide if it should recognize the legitimacy of a new government, which
E. deciding whether they should recognize the legitimacy of a new government that

Please find and explain the best option?

OA B