We can see from the first paragraph that the first Labor Day march ______.

A．draw people's attention to the striking contrast between the rich and the poor
B．make prominent the important role of the working class in society
C．win for the workers the right to shorter working hours
D．expose the exploitation of the workers by their bosses

A．a moderate labor leader
B．an extreme-anarchist in the labor movement
C．a devoted socialist fighting against exploitation of man by man
D．a firm anti-capitalist demanding the elimination of wage slavery