The writer suggests that a successful leader must ______.

A．The attitudes of the masses of people are best expressed by sociology texts.
B．The nearest thing we have had to a proletarian literature is the dime novel.
C．The study of the formal literature alone will not enable the historian to understand the attitudes and interests of the common people.
D．Because the themes in the dime novels were not good, they could no longer be legally distribute

A．written for and read by the great masses of people.
B．distinguished by its devotion to pornography.
C．distinguished by its elegant style.
D．written for, but not actually read by, most peopl