1-C. The development of new technologies in the twentieth century meant a need for greater skills and rapid growth of secondary and higher education.The development of new technologies in the twentieth century meant a need for greater skills and rapid growth of secondary and higher education.
2-C. The idea that one becomes an "adult" when one turns a certain age (for example, on one's twentieth birthday) did not exist.The idea that one becomes an "adult" when one turns a certain age (for example, on one's twentieth birthday) did not exist.