We can see here that the accurate comparison between McDonald's and Kentucky Fried Chicken (KFC) is:
B. McDonald's undersold its competition, while Kentucky Fried Chicken helped its founder pay his way through college.
This comparison contrasts the business strategies or achievements of McDonald's and KFC. It highlights that McDonald's was known for its competitive pricing strategy, where they undersold their competition, focusing on lower prices.
On the other hand, the statement about KFC's founder, Colonel Sanders, receiving help in paying his way through college suggests a personal aspect of the founder's history rather than a business strategy.