The mourning period starts from ______.

A．using chemicals during the Korean War
B．having offered chemicals to South Korea
C．using chemicals to kill its enemies in 1968 and 1969
D．not having informed the soldiers of the harmfulness of Agent Orange

A．they are coming to terms with the humanitarian crisis
B．they can get more help from the outside world
C．they can get supplies through to the areas of need
D．they can help themselves