In december 1979, soviet troops marched into afghanistan to put down a revolt at the request of a: the afghan government b: the united states c: al-qaida d: the taliban

A) The Afghan government

Nation of conflicting ethnic groups

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.