What phrase best defines a star system?

The meaning of star system is group of hundreds of stars , that form around the same time .

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.

Ilam  is the most commonly practiced religion