At the Profit-Maximising Amount of Labour, the Wage Equals Which

At the profit-maximising amount of labour, the wage equals which of the following? (i) price × the marginal product of labour
(ii) the value of the marginal product of labour
(iii) marginal cost

A) (i) and (ii)
B) (ii) and (iii)
C) (i) only
D) (iii) only