Final answer:
Spain's interest in the negotiations at the Peace of Paris was to gain control of Gibraltar and secure fishing rights off the coast of Newfoundland, among other objectives like maintaining influence in the Americas. The correct option is A.
Step-by-step explanation:
Spain's interest in the negotiations at the Peace of Paris was to gain control of Gibraltar and secure fishing rights off the coast of Newfoundland. The Peace of Paris, primarily associated with the treaties which ended the American Revolutionary War, involved various European powers with complex agendas. During these negotiations, Spain sought to regain territories and rights lost during previous conflicts.
In regards to the question posed, Spain's aspiration to control Gibraltar was only a part of their broader objectives. Although not explicitly mentioned in the peace negotiations, Spain's interest in fishing rights and territorial control in areas like the Caribbean and the Mississippi were also of importance in defining their international policy during this period. Spanish control over navigation of the Mississippi River was a significant topic and was notably addressed in Pinckney's Treaty as they sought to retain their influence in the Americas.
Hence, Option A is correct.