A recent study of a representative sample asked subjects what acts they considered to be sex. What ...

A recent study of a representative sample asked subjects what acts they considered to be sex. What did the researchers conclude from their findings?
 
  a. There is a universal consensus as to which behaviors constitute having sex, regardless of age and gender.
  b. There is no universal consensus as to which behaviors constitute having sex, but the age and gender of the participant had a significant effect on one's views regarding sexual behaviors.
  c. There is no universal consensus as to which behaviors constitute having sex, but the age of the participant had a significant effect on one's views regarding sexual behaviors.
  d. There is no universal consensus as to which behaviors constitute having sex, but the gender of the participant had a significant effect on one's views regarding sexual behaviors.