Is this paragraph’s main idea stated or implied?

The greatest gift the Sumerians gave the world was the invention of writing. The Sumerians were a wealthy people. They needed some way to keep track of what they owned. They began drawing pictures. They used a reed as a pen. They drew on soft pieces of clay. The soft clay was then dried in the sun. The tablet became a permanent record. Later, the Sumerian drawings changed into wedge-shaped symbols. This kind of writing is called cuneiform. By putting symbols together, the Sumerians could write entire sentences.

A.
implied

B.
stated

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stated

They needed some way to keep track of what they owned.

stated

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stated

B. stated

Jimmy/Rebecca -- please use the same name for your posts.

I'll be glad to check your answer.

Ask Katie pickle I am sure she can help