According to the passage, prostitution falls into the category of______.

A．professional crime
B．organized crime
C．index crime
D．white-collar crime

A．Under the Greenwood Tree: Hardy's Ambiguous Triumph
B．The Real and the Strange: The Novelist's Shifting Realms
C．Hardy's Novelistic Impulses: The Problem of Control
D．Divergent Impulses: The Issue of Unity in the Novel