B. was designed to remove politics from municipal administration
C. private ownership and free markets
I think it's Indus. I looked it up and it said that it 'developed in the 3rd millennium BCE, making it one of the earliest of the world's civilizations.'
<u>Type of plumbing that Harappans had:</u>
The plumbing in the Harappans civilization was one of the most advanced plumbing of that time and in their plumbing system they had created proper sewage systems, sanitation systems, and there was a proper method of disposing the waste of the civilization.
Along with the plumbing, there was proper civic planning in that civilization. This plumbing system of Harappans civilization was really important because it was the first civilization that had such modern plumbing and civic planning and was modern in this way.
A letter written during the time a historical event occurred would be considered a primary source, as opposed to secondary source, since it gives the point of view of someone who lived through the event in. I think