The passage commences by highlighting Europe's continual attempt to adapt itself in a multipolar world by striving to be a dynamic entity- nationally and internationally {"changed its internal structure and invented new ways of thinking about the nature of international order". Post this, the author portrays how certain stimuli in the modern world has lead Europe to review its political components {"set aside the political mechanisms through which it had conducted its affairs for three and a half centuries"} and to make changes in its economic structure ("established a common currency"}. Thus, the passage presents two key points: (1) Europe's persistent effort to adapt to a shifting global landscape and (2) the strategies Europe has employed to achieve this within the current multipolar configuration. Option D effectively encapsulates these points.
Option A: While this option addresses point (1), it neglects to consider point (2). Therefore, Option D stands as the correct choice.
Option B: This overlooks point (2) and inaccurately attributes Europe's unification solely to its endeavor to rapidly adapt.
Option C: This fails to fully capture the essence of the passage and neglects to address point (1).
So, the correct option is (D): Europe has chosen to lower political and economic heterogeneity, in order to adapt itself to an emerging multi-polar world.
Read the sentence and infer the writer's tone: "The politician's speech was filled with lofty promises and little substance, a performance repeated every election season."