Sumer is important in world history because it was the world first civilization
Answer: Option A
Step-by-step explanation:
Sumer which was in Mesopotamia was the world's first civilization and it started around 3000 BC. The civilization were able to create a modern working society making it an important part of the world's history.
Sumerians contributed by inventing the first form of writing, a number system, the first wheeled vehicles, irrigation for farming, sun dries bricks, the wheel, the chariot, the sail boat and invented some games like checkers also and many more.