It may be helpful to reflect on whether the concept of ‘great power’ can be used interchangebly with concepts such as ‘superpower’ and ‘hegemon’. The concept of great power may refer to superpower, as was the case during the Cold War. However, great power also refers to hegemon, if there is only one great power dominating the international system. Looking at the polarity in the system, Welch and Nye conclude that “we usually call the strongest country within a unipolar system a hegemon (from the Greek meaning “leader”); we call the strongest countries in a modern bipolar system superpowers; and we call the strongest countries within multipolar systems great powers”. Therefore, the correct option is B.