When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher, the stream should be directed at the ________.

A
base of the flames, moving the horn from side to side, following the flames upward as they diminish
B
top of the flaming area, moving the horn from side to side, following the flames downward as they diminish
C
center of the flaming area, moving the horn vertically from top to bottom
D
bottom of the flaming area, moving the horn vertically to the top following the flames upward as they diminish
E