A brief reading of the sentences suggests that the paragraph must be about the disparity in the representation of different genders. Sentences 1,2,3, and 5 are concerned with the problems that arise when the representation of females is less. 4, however, runs tangent to the discussion at hand. It talks about 'structural inequalities'. This sentence, if included in the paragraph, would render it incomplete as all the other sentences talk about gender inequality and not structural inequality. Thus, 4 is out of context here.