Flash point of fuel oil is __________________?
(A) 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
(B) temperature at which it solidifies or congeals
(C) temperature at which it catches fire without external aid
(D) indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
(E) none of the above

