The correct answer is: C. on, in
The preposition “on” is used to indicate that something is located on a surface. The preposition “in” is used to indicate that something is located inside of something else. In this case, the breakfast is located on the table, which is a surface. Therefore, the correct answer is “on, in.”
The other options are incorrect because they do not accurately describe the location of the breakfast. The preposition “at” is used to indicate a specific location, but it is not clear what specific location the breakfast is located at. The preposition “before” is used to indicate that something is located in front of something else, but it is not clear what the breakfast is located in front of. The preposition “into” is used to indicate that something is moving into something else, but it is not clear what the breakfast is moving into.