A = Arthropoda is the largest phylum of Animalia which includes insects.
R = Over two-thirds of all named species on earth are arthropods.
(A) Both Assertion and Reason are true and Reson is the correct explanation of Assertion.
(B) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(C) Assertion is true but reason is false
(D) Both Assertion and Reason are false.
(E) Assertion is false but reason is true.
