Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A : The stability order of +1 oxidation state of Ga, In and Tl is Ga<In<Tl.
Reason R : The inert pair effect stabilizes the lower oxidation state down the group.
In the light of the above statements, choose the correct answer from the options given below :