Answer: Industry
Explanation:
As per theory of Erikson, industry is the feeling of competence which is experienced by a child if they are encourage to perform task or initiative by themselves. This helps children to attain the desired goals with the help of confidence on own ability and skills.
According to the question,Belinda will attain good sense of industry as she is working on her math skills with confidence and concentration through reading books and studying for hours.This will encourage her to rely on her skills.