What is the evidence to suggest that exposure to sex hormones in the womb affects sexual ...

What is the evidence to suggest that exposure to sex hormones in the womb affects sexual orientation?
 
  a. Females exposed to higher than normal levels of male hormones in the womb develop masculinized external genitalia and report more same-sex sexual activity.
  b. Males whose mothers were on hormone replacement therapy while pregnant report more attraction to males than the general population.
  c. The testosterone hormonal patch used to stimulate sexual desire in females also leads to higher birth rates of babies who later identified themselves as lesbians.
  d. Women who took drugs to stimulate ovulation had sons who were more likely to experiment with same-sex activity.