Which of the following best defines the word "aggressive" ( Line 3, Paragraph 6)

A．the opinions which contradict the established beliefs
B．criticisms that shape everyone's experience
C．the tendencies that help the newcomers to see office matters with a fresh eye
D．the ideas which usually come up with new ways of management in the organization

A．prolonged medical procedures
B．inadequate treatment of pain
C．systematic drug abuse
D．insufficient hospital care