The content of the passage can be best described as______.

A．Persuasion.
B．Summarization.
C．Argumentation.
D．Coherin

A．to change the senior managers at offices in cities like Chicago, Detroit and San Francisco
B．its clients must deal with rapidly changing marketing and media trend
C．to coordinate communications solutions for clients across all disciplines as effective as possible
D．to become the largest agency in the world in revenue