题目内容
（请给出正确答案）
[主观题]
听力原文： Firefighters are battling a blaze in California. Investigators think a campfire
might be the cause of the flames. Officials said several factors are working in their favor to help get the flames under control.
Given the weather conditions, the wind subsiding, that's reason for optimism. The amount of fuel that has been consumed there, that's reason for optimism. The number of personnel we have here, the plans we have to continue to operate our aircraft through the night as needed and as appropriate, those are all reasons for optimism.
What caused the blaze in California？
A．A campfire.
B．Smoke.
C．Lightening.
D．Unclear.
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