According to erikson, from roughly ages 6 to 12, children go through the period characterized by efforts to meet the challenges presented by parents, peers, school, and the other complexities of the modern world. this stage is called
(a) initiative versus guilt
(b) industry versus inferiority
(c) autonomy versus shame and doubt
(d) identity versus role diffusion

Industry vs inferiority

Explanation:

Industry vs inferiority is the fourth stage of the psycho-social developmental stage of Erick Erickson. This stage occurs between the age of 6 to 12. Erickson shows human being development throughout the stages. No one can skip a single stage.

All stages are very important in the development of a person. At this stage this very important for both parents and teachers to encourage the children and to offer support to the children. Parents develop a sense of competence in their kids.  

Thus in the above statement, Erickson discusses here the fourth stage called industry vs inferiority.  

answer; john b watson,(observable behavior);