The two moons of Mars, Phbos and Deimos, are irregularly shaped like potatoes. These two moons may once have been asteroids. They orbit Mars because Mars

This type of energy is called radiant energy.

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.

"the socialist system that had been in place had brought economic ruin to the country." i hope this !