According to research (van Anders, Hamilton, & Watson, 2007), who is likely to have the highest ...

According to research (van Anders, Hamilton, & Watson, 2007), who is likely to have the highest testosterone levels?
 
  a. Eric, who cannot seem to stay in a long-term relationship, and was called a commitment-phobe by his last girlfriend
  b. Don, who just proposed to Sandra, his girlfriend of 2 years, but secretly longs for his former girlfriend, Jen, whom he dated for 6 years
  c. Sergio, who has been married for 14 years to Sarafena, but also has a mistress, Donatella, whom he has been seeing for the last 10 years
  d. Eduardo, who has been married for 11 years and has four boys ages 2 through 7, and is secretly relieved that he has no daughters