A: Density
All the rest are chemical, not really sure exactly how to explain it. But I hope this helped!
They followed the lines of ancient glaciers. They were defined by large farms and grasslands. They followed the system of rivers, canals, and dams. They were naturally defined by deserts, mountains, and seas.
Answer:
The experience that Aleksandr Solzhenitsyn describe in the excerpt from the Gulag Archipelago is letter c, in which it reads that the experience of being arrested. It can be seen in the excerpt from the Gulag Archipelago where in Aleksandr describes his experience from being arrested
answer is c