Final answer:
Option (a), The phrase 'Scramble for Africa' summarizes the late 19th century imperialistic actions that brought European powers to the brink of war, as they competed for territorial expansion in Africa, leading to heightened tensions and a naval arms race.
Step-by-step explanation:
The imperialistic actions that brought European powers to the brink of war in the late 19th century can be summarized by the phrase 'Scramble for Africa'. This period was marked by intense competition among European nations, as they sought to expand their empires by claiming territories in Africa and Asia. Nations like Great Britain, France, and Germany were involved in a fierce rivalry, racing to acquire colonies for resources and markets, which led to heightened tensions and the brink of conflict.
The Scramble for Africa saw an unprecedented rush for territorial acquisition on the African continent, with European countries vying for control over its lands and resources. By 1900, nearly 90% of Africa was under European control. The impact of such imperialism incited a naval arms race, particularly between Britain and Germany, and strained diplomatic relations, creating an atmosphere ripe for war.