Testing the explanation link directly:
Cost-push inflation arises whenever a rise in the cost of inputs (labour, raw materials, profit margins) forces producers to raise prices even without a change in demand. To verify (A), list its stated causes: wage-push and profit-push inflation, both of which are textbook categories of cost-push inflation, so (A) holds. To verify whether (R) explains (A), isolate wage-push inflation specifically: it occurs when wage increases outpace productivity gains, so the extra wage cost per unit of output must be recovered through higher prices. This is precisely the mechanism by which wage-push inflation contributes to cost-push inflation in (A). Since (R) accurately describes the cause-effect chain behind one of the two factors named in (A), it serves as a valid explanation of (A), supporting option (1).