Flash point of fuel oil is __________________?

A. temperature at which it catches fire without external aid

B. temperature at which it solidifies or congeals

C. minimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

D. indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

E. none of the above

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