Cathleen is having trouble learning the steps involved in using a microscope correctly. if you consider vygotsky's description of how children themselves get through difficult tasks, you should suggest that cathleen:

In Vygotsky’s description, in helping Cathleen solve her problem, what she must do and is suggested is that she needs to work with a partner or to work with another person in a way that will help her step by step in coping up with the task.

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

the answer to your question is,

d. when a child was born.

-mabel < 3