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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.
Assertion : In taking into account the fact that any object which floats an average density must have less than that of water, during world war I, a number of cargo vessels are made of concrete.
Reason : Concrete cargo vessels were filled with air.
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