A subset H of a group (G, ∗) is a group if – McqOptions

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1.	A subset H of a group (G, ∗) is a group if
A.	a, b ∈ H ⇒ a ∗ b ∈ H
B.	a ∈ H ⇒ a-1 ∈ H
C.	a, b ∈ H ⇒ a ∗ b-1 ∈ H
D.	H contains the identity element
Answer» B. a ∈ H ⇒ a-1 ∈ H

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