Which of the Following Statements Regarding the Trucking Industry Is

Which of the following statements regarding the trucking industry is correct?

A) The recession of 2007 -2009 caused many trucking firms to exit with many firms filing for bankruptcy.
B) The trucking industry most closely resembles an oligopoly.
C) Even though there is a high degree of competition, firms in the trucking industry are able to sustain positive economic profits as a result of a substantial degree of product differentiation.
D) The trucking industry was largely unaffected by the recession of 2007-2009 mainly because the industry is comprised by large firms with significant market power.