One way for students to earn money is by babysitting. this work is usually done in the evenings and on weekends, so it is easy to fit into a school schedule. another way students can earn money is to start a dog-walking business in their neighborhood. students can also make money by washing cars or mowing lawns. this paragraph is missing a topic sentence. which of the topic sentences below best states the paragraph’s main idea? a. students should not work because they need to focus on school. b. students can earn more money by babysitting than they can by walking dogs. c. there are several ways for students to earn money. d. it is difficult for students to find jobs.