单选题：Text 1To produce the upheaval in the United States that chan

Text 1
To produce the upheaval in the United States that changed and modernized the domain of higher education from the mid-1860' s to the mid-1880' s, three primary causes interacted. The mergence of a half-dozen leaders in educa-tion provided the personal force that was needed. Moreover, an outcry for a fresher, more practical, and more ad-vanced kind of instruction arose among the alumni and friends of nearly all of the old colleges and grew into a move-ment that overrode all conservative opposition. The aggressive "Young Yale" movement appeared, demanding par-tial alumni control, a more liberal spirit, and a broader course of study. The graduates of Harvard University simul-taneously rallied to relieve the University' s poverty and demand new enterprise. Education was pushing toward high-er standard in the East by throwing off church leadership everywhere, and in the West by finding a wider range of studies and a new sense of public duty.
The old-style classical education received its most crushing blow in the citadel of Harvard University, where Dr. Charles Elliot, a young captain of thirty-five, son of a former treasurer of Harvard led the progressive forces.
Five revolutionary advances were made during the five years of Dr. Elliot administration. They were the elevation and amplification of entrance requirements, the enlargement of the curriculum and the development of the elective system, the recognition of graduate study in the liberal arts, the raising of professional training in law, medicine,and engineering to a postgraduate level, and the fostering of greater maturity in student life. Standards of admission were sharply advanced in 1872 - 1873 and 1876 - 1877. By the appointment of a dean to take charge of student af-fairs, and a wise handling of discipline, the undergraduates were led to regard themselves more as young gentlemen and less as young animals. One new course of study after another was opened up--science, music, the history of the fine arts, advanced Spanish, political economy, physics, classical philology, and international law.
根据以上材料，回答题。
The passage mainly deals with__________. A．innovations in the United States' s higher education in the late 1800s
B．Harvard University graduates' success
C．the development of Harvard University
D．the aggressive "Young Yale" movement