This question tests the understanding of global language adoption. The correct answer is D because languages associated with economic power tend to become global standards due to the influence of trade and international relations. Option A is incorrect because while a rich literary history is valuable, it is not the primary factor in global adoption. Option B is incorrect because a large population of speakers does not necessarily lead to global adoption if the language lacks economic or political influence. Option C is incorrect because simplicity of grammatical structure does not correlate directly with global adoption.