Which problems led to the decline of sumer? select all correct answers.
a. fights over boundaries and water rights.
b. constant flooding of the area
c. long dry spells without any rain
d. the cities grew too fast

i would say your answer would be the second option.

hope this !

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44