The correct answer is D. Classic
Step-by-step explanation:
In history, the term "classic" is used to define civilizations such as Ancient Greece or Ancient Rome because many cultural elements of these civilizations including language, political ideas, artistic techniques, philosophical ideas, etc. spread to other civilizations and remain even in our modern civilizations. This means classical civilizations are those that impacted the world through its culture and features and whose impact was long-lasting. According to this, the correct answer is classic.