Answer:
B) developing country
Explanation:
A developing country is a country with a growing economy and infrastructure. A growing economy is often depicted by rising per capita GDP of the populace. Examples are South Africa, Nigeria, e.t.c
A developed country is one with an advanced infastructural and technological innovations. They are usually characterized by a high standard of living and available social infrastructures.
Gamma rays, x-rays, ultraviolet, infrared, microwaves, radio waves
Equality, people had their own place in the social structure
It doesn't sound important
A broad, marshy, triangular area of land formed by silt deposits at the mouth of a river.
I took notes about this a long time ago