According to the Text,which Description Corresponds to a Perspective Known

According to the text,which description corresponds to a perspective known as radical behaviourism?

A) a school of thought that denies free will,emphasizes observable phenomena,and claims that all behaviour is learned from the environment
B) the belief that human behaviour is controlled by a blend of genetics and the environment (the nature-nurture debate)
C) the belief that human social behaviour is predicated upon the biological drive to procreation and survival
D) an emphasis placed on how learning is a function of the consequences that follow behaviour