Answer: A
Explanation: The correct answer is letter A, industry. According to Erikson, at this age children are expected to go through the industry vs inferiority stage, where they have to learn to enjoy applying themselves into tasks or they feel inferior.
This child in particular is developing a strong sense of industry that allows her to enjoy doing things such as rehearsing her math skills or reading books. That will help her during her growth as a human and in order to successfully go through the next stages that Erikson describes.