Answer: B) I read the story about the history of the South that Professor Rasco assigned.
Step-by-step explanation: when writing, we should pay attention to the rules of capitalization, in order to use them properly. In the given sentence "South" should be capitalized because it is referring to a region, so it is a proper noun. "Rasco" is capitalized because it is the last name of a person, and "Professor" also needs to be capitalized in this case, because it is referring to a specific person ("Professor Rasco"), when it is referring to the profession in general, it shouldn't be capitalized.