The Boulevard Saint-Michel, Shown on Map 22

The Boulevard Saint-Michel, shown on Map 22.2: The Modernization of Paris, ca. 1850-1870, was one of Baron Haussmann's most controversial projects because its construction

A) required the razing of much of Paris's medieval core.
B) took land that had been set aside for the Bois de Boulogne.
C) meant moving the Arc de Triomphe.
D) meant destroying the Fortress Wall (1841-1845) .