How are the guards set up on both sides of DMZ? What does that tell you of either side?

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Ibelieve it would be d. philosophy.hope it !