Jenny scored a low grade on her science test and wants to

improve. She develops a hypothesis stating “If I study 2 more hours a day for a week then I will get a better
grade next time because I will have more time to go over the information.” She gets 5 of her classmates that also scored low to try this out with her to see if it helps their grades. Which one of these can be classified as the dependent variable?

a; time they will study
b; their grades on the next test **
c; the number of classmates she has studying with her

is b the answer ?