Daft groups the dimensions of organization design into two basic categories. He sorts structural dimensions as formalization, specialization, the hierarchy of authority, centralization, professionalism and personnel ratios. So, (a), (b), (d), (e) are associated with the structural dimensions of organizations. He labels contextual dimensions as size, technology, environment, goals and strategy, and culture. Among these, size can be used to define not the whole but the part of an organization and it is generally measured by the number of employees. For example, the size of a factory belonging to a big business can be expressed by mentioning the number of employees. However, there are also other criteria such as total sales, total profit, total production amount and total assets to indicate size. In the given example, too, the number of the students are mentioned to describe the size of these organizations. So, choice (c) is the correct answer.