The name of the site is: Hoyo Negr*o
The site is located in the underwater cave of Mexican Yucatan Pennisula. In that site, scientists have found the what they considered as the oldest skeleton in America (which is around 10,000 - 12,000 years old)
In spanish, the site is translated as "the black hole" because it's located in a very scary dark pit.
Answer
The answer is ziggurat.
A ziggurat is a Mesopotamian temple and were generally very large, showing off genuine Mesopotamian architecture.
A mud-brick house isn't exactly monumental, a stela is a slab of stone, and a seed plow is a farming tool.
Heinrich Himmler was head of SS
What period post another question showing the period and I can help.
I think the answer would be D. because all of the above are true.