B because that’s means that you have more people going to
the city
Question 1: 1/3
Question 2: The south
Question 3: The cotton gin
Question 4: N/A
Answer: D
Explanation: Because the Gupta's developed the concept of zero, it helped mathematics greatly. By looking at the other side of the organizer, it looks like the impact of have the first efficient post office helped improve communication, so it would make sense that the invention of algebra helped develop pi.
