According to the news item, what make（s)the major bush fire spread？A．Two large fires that

According to the news item, what make(s)the major bush fire spread？

A．Two large fires that were joined up into a big one.

B．High temperatures and more powerful winds.

C．The burning in key areas that was out of control.

D．Exhausted firefighters not ready for their most challenging day.

请帮忙给出正确答案和分析，谢谢！