Its C. “Highest-Paying Occupations.” Occupational Outlook Handbook. Bureau of Labor Statistics and US Department of Labor, 29 March 2015. Web. 1 May 2015.
The answer is A. "How to Become a Lawyer." Occupational Outlook Handbook. Bureau of Labor Statistics and US Department of Labor, 29 March 2012. Web. 1 May 2013.
A line of reasoning that presents the opposite side of the author's argument is called (I believe) a counterargument. It states exactly the different thing from what you have first stated.