In what stage of demographic transition are most countries that send out immigrants?

The answer is:  "Stage 2" .

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.

Answer(a); // soil salinization and waterlogging;