A tank which has been sealed for a long period of time can be dangerous because （）.<br>A:steel surfaces consume oxygen by rusting<br>B:sealed tanks usually form a vacuum<br>C:moisture condenses in the tank, displacing the oxygen<br>D:most tank coatings give off poisonous vapors in the presence of moisture

A tank which has been sealed for a long period of time can be dangerous because （）.
A:steel surfaces consume oxygen by rusting
B:sealed tanks usually form a vacuum
C:moisture condenses in the tank, displacing the oxygen
D:most tank coatings give off poisonous vapors in the presence of moisture

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