Question

Which geographic characteristics were factors in the decline of Sumer?

Choose all answers that are correct.

A.
It was located on the Persian Gulf.

B.
It was located far away from rivers.

C.
It was located on a flat plain that made it vulnerable to attack.

D.
Flat land with poor drainage led to salinization from irrigation waters.

Answer 1

It says CHOOSE ALL THAT ARE CORRECT. So it's A & D

Answer 2

It was that "Flat land with poor drainage led to salinization from irrigation waters," that was a factor in the decline of Sumer, since this led to a build up of salt in the soil, which greatly reduced agricultural output.