Medical Research Has Demonstrated That Individuals Who Have Higher Levels

Medical research has demonstrated that individuals who have higher levels of testosterone are more assertive,dominant,and competitive.The social psychologist Allan Mazur noticed in his study of chess competitions that testosterone levels rose in chess players before a match and then rose again in the match's winner,but they fell in the loser.What does this suggest about the origin of gender?

A) Hormones play a much larger role in gender than is usually acknowledged.
B) Nature is the most important factor in determining gender.
C) Gender is completely social in origin and our bodies are simply arbitrary vessels for society to guide.
D) Gender comes from an interaction between biology and social contexts.