Which topic sentence fits the following paragraph? . . . It's the study of little choices (Should I take the chocolate or the strawberry?) and big choices (Should we require a reduction in energy consumption in order to protect the environment?). It's the study of individual choices, choices by firms, and choices by governments. Life presents each of us with a wide range of alternative uses of our time and other resources; economists examine how we choose among those alternatives. Tregarthen, Rittenberg, Economics, Worth Publishers. Economics is the study of choices by governments. Being successful is the art of learning to decide. Economics is the study of how people choose among the alternatives available to them. Making decisions involves learning when to think for oneself and when to ask for advice