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Anonymous User Best Answer
Q/Z={Z+p/q ;p/q€Q} let q(Z+p/q)=Z+q.p/q=Z+p=Z(zero of Q/Z) so order of each element of Q/Z is finite let H is subgroup of Q/Z then H is not isomorphic to Z bcz order of each element of H is finite but order of each element of Z is not finite. so options A