Final answer:
The earliest recorded instance of a fully developed chariot is attributed to Ancient Mesopotamia, dating back to the early 2nd millennium BCE.
Step-by-step explanation:
The earliest recorded instance of a fully developed chariot appears in the history of Ancient Mesopotamia. Evidence of chariots in Mesopotamia dates back to the early 2nd millennium BCE, specifically around 2000-1800 BCE. Chariots played a significant role in the Sumerian and Akkadian military and were used as a platform for archers and spearmen.
Though there were later advancements and adaptations by other civilizations such as Ancient Egypt, Ancient Greece, and the Roman Empire, the Mesopotamian chariots are seen as the earliest known instances of this vital military and transportation technology. As such, based on the recorded history, the correct answer to this question would be B) Mesopotamia.