In the event that two monozygotic twins demonstrate noticeable psychological differences later in life, this is likely the result of pre-zygote influences

Mary is planning to take a year-and-a-half leave from her job because she wants to stay home and care for the needs of her newborn child Mary believes that during the first 18 months of a child's life, it is critical that she make herself available to her child to meet his needs and give him the attention he deserves. Erikson would say that Mary's decision comes at a good time to address what stage of her child's development?

a) Erikson's theory of psychosocial development stage b) Erikson's trust-versus-mistrust stage c) Erikson's autonomy-versus-shame-and-doubt stage d) Erikson's temperament behavior stage

The correlation between the two variables is generally

a. positive b. negative c. zero d. positive, negative and sometimes even zero