Which of the following is an example of an improperly used subordinate clause?

AThe group moved to the center of the room, because the winds had begun to shake the windows.

BThe storm moved closer, surrounding the house like a lion eating its prey.

CThe wind shrieked and the roof groaned and when the first tiles gave way, a woman screamed.

DThe smell of fear spread through the room. Because all those gathered there thought they would die soon.