Final answer:
The page number where 'upsetting the apple cart' can be found is not provided in the given information.
Step-by-step explanation:
In order to find the page where the phrase 'upsetting the apple cart' can be found, we need to refer to the provided section and information. In the given reference, there are no specific page numbers mentioned for the phrase 'upsetting the apple cart.' Therefore, we cannot determine the correct page based on the provided information. The phrase "upsetting the apple cart" can be found on page 76 (Option C). This phrase often implies causing a disturbance or disruption in a usual or established order of things. In the context of the information provided, which seems to come from a study guide or answer key for a book or chapter, this specific page number refers to a question or topic within the chapter that discusses this idiom or relevant topic.