How does the concept of 'fulfillment' in Matthew's Gospel, particularly concerning Old Testament prophecies, contribute to his portrayal of Jesus as the Messiah?

A It primarily serves to demonstrate Jesus' miraculous abilities and supernatural power. B It functions as a literary device to connect Jesus' life with Jewish history and expectations, emphasizing his legitimacy as the promised King. C It solely focuses on predicting specific dates and events in Jesus' life, proving his divine origin. D It aims to replace the Old Testament Law with a new set of ethical guidelines.