Participation in extracurricular activities is related to higher levels of self-esteem for adolescents

According to the article Going to Pot, about adolescent drug use, a bathroomscale that is stuck on a single

number will always be (a) reliable, but not valid (b) valid, but not reliable (c) valid and reliable (d) neither reliable or valid

According to the text author, which of the following is a recent evolutionary development?

A) emotional behaviors B) emotional feelings C) the capacity to recognize emotional behaviors D) hormonal changes during emotion E) the experience of positive emotions