Who made Roman numerals? Why did they make Roman numerals? What does Roman numerals mean? Answer the questions in separate sentences.

The Roman numeral system for representing numbers was developed around 500 b.c. As the Romans conquered much of the world that was known to them, their numeral system spread throughout Europe, where Roman numerals remained the primary manner for representing numbers for centuries.

Idont know which one is right   but i know that c is wrong and a might be wrong