Final answer:
The League of Nations was created to prevent future wars and resolve conflicts peacefully.
Step-by-step explanation:
The correct way to complete each sentence is B. Prevent future wars, resolve conflicts peacefully.
The League of Nations was created with the goal of preventing future wars. Through its charter, member nations pledged to resolve conflicts peacefully, promoting global security and stability.
By engaging in diplomatic negotiations and collective actions, the League aimed to avoid resorting to military alliances or aggression, as stated in option A.
Options C and D, promoting economic competition, colonization, pursuing imperialistic goals, and suppressing dissent, are not aligned with the intended purpose and principles of the League of Nations.