Final answer:
John Quincy Adams saw America's future as a chance to expand and prosper economically, fitting with the concept of Diplomatic Nationalism.
Step-by-step explanation:
John Quincy Adams envisioned the future of America as an opportunity to expand its influence and promote its economic prosperity. As Secretary of State under James Monroe, Adams strongly believed in the 'unique virtue' of the United States and its destiny to remake the world in its image. This belief, known as Diplomatic Nationalism, entailed fostering foreign trade, pursuing continental expansion, and reducing European influence in Latin America. Adams's view aligns most closely with option b: A pathway towards economic prosperity.