The E-S (empathizing-systemizing) theory states the following :

The E-S (empathizing-systemizing) theory states the following
 
  A) Males are stronger at empathizing than females.
  B) Males are under-perform females in spatial tasks.
  C) Males are stronger at systemizing and females are stronger in emotion recognition, social sensitivity, and verbal fluency.
  D) Males and females have identical sex differences and brain organization.

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Given the research on genital ambiguity, the authors of your text conclude that
 
  A) sex is dichotomous, gender is not.
  B) gender is dichotomous, sex is not.
  C) neither sex nor gender is dichotomous.
  D) more research needs to be done before any conclusions are drawn.