Question

Which among the followings is true ?
(a) Every nonempty subset H of a group G is its subgroup
(b) Every nonempty subset H which closed under multiplication is a subgroup of G.
(c) A subgroup of a noncommutative group also must be noncommutative
(d) IH is a subgroup of an infinite group G then H also must be infinite​

Answer 1

Answer:

(d) IH is a subgroup of an infinite group G then H also must be infinite