单选题 When the author talks 'about the political dimensions of the investigative journalism he refers to ______.

A、 John Bunyan's Pilgrim's Progress and one of its characters "Muckrakers"
B、 its function of cleaning the dirt off the floor in public places
C、 its relentless exposures of political and social evils
D、 its indispensable status to the well-being of society

【正确答案】 C

【答案解析】参见第二段第二句话。