请教：GWD23-15

yinhang_1217

      Some historians contend that con-
       ditions in the United States
       during the Second World War gave rise to a
Line  dynamic wartime alliance between
 (5)  trade unions and the African American
       community, an alliance that advanced
       the cause of civil rights.  They con-
       clude that the postwar demise of this
      vital alliance constituted a lost oppor-
(10)  tunity for the civil rights movement that
       followed the war.  Other scholars,
       however, have portrayed organized
       labor as defending all along the rela-
       tively privileged position of White
(15)  workers relative to African American
       workers.  Clearly, these two perspec-
       tives are not easily reconcilable, but
       the historical reality is not reducible
       to one or the other.
(20)         Unions faced a choice between
        either maintaining the prewar status
        quo or promoting a more inclusive
       approach that sought for all members
       the right to participate in the internal
(25)  affairs of unions, access to skilled
       and high-paying positions within the
       occupational hierarchy, and protec-
       tion against management’s arbitrary  
       authority in the workplace.  While
(30)  union representatives often voiced
       this inclusive ideal, in practice unions
       far more often favored entrenched
        interests.  The accelerating develop-
       ment of the civil rights movement
(35) following the Second World War
       exacerbated the unions’ dilemma,
       forcing trade unionists to confront
       contradictions in their own practices.

The passage is primarily concerned with

• providing a context within which to evaluate opposing viewpoints about a historical phenomenon.
  
• identifying a flawed assumption underlying one interpretation of a historical phenomenon.
  
• assessing the merits and weaknesses of a controversial theory about a historical phenomenon.
  
• discussing the historical importance of the development of a wartime alliance.
  
• evaluating evidence used to support a particular interpretation of a historical phenomenon
  
  请问：E错在哪儿了？