Why, according to the passage, did ancient Chinese coins have a square hole in the center?

A. Because it would be easier to put them together and carry them around.
B. Because it would be lighter for people to carry from place to place.
C. Because people wanted to make it look nicer.
D. Because people wanted to save the expensive metal they were made from.
A. Because it would be easier to put them together and carry them around.
B. Because it would be lighter for people to carry from place to place.
C. Because people wanted to make it look nicer.
D. Because people wanted to save the expensive metal they were made from.

【答案】