At the beginning of the twentieth century, Edward Stratemeyer was advertising for writers to help him—
people not only who could write children's mystery books for his popular syndicate, but mimicking his successful formula also in order to continue the many series he had begun but was too busy to continue.
A. people not only who could write children's mystery books for his popular syndicate, but mimicking his successful formula also in order to continue
B. people who could not only write children's mystery books for his popular syndicate but also mimic his successful formula in order to continue the many series he had begun but was too busy to continue
C. someone who not only could write children's mystery books for his popular syndicate, but also to mimic his successful formula in continuing
D. that being people who could not only write children's mystery books for his popular syndicate, but mimicking his successful formula for continuing
E. being people not only who could write children's mystery books for his popular syndicate, but mimic his successful formula also, continuing
Source - Ready4Gmat