Final answer:
In a middle school Social Studies class going over one topic for two weeks, there would usually be three main ideas. Option C
Step-by-step explanation:
The number of main ideas in a topic can vary depending on the depth and complexity of the subject. However, if you are going over one topic for two weeks in a middle school Social Studies class, there would usually be three main ideas.
For example, if the topic is the American Revolution, the three main ideas could be: causes of the revolution, key events during the revolution, and the impact of the revolution. Each of these main ideas would be further explored and discussed over the two-week period in class.
Therefore, the answer to the question is C) Three.