Whats the answer to life and everything else?

The answer to life is 42...The optimum angle for white light to refract through water and thus form a rainbow is between 40.89 and 42 degrees."Two physical constants in the universe are the speed of light and the diameter of a proton. It takes light 10 to the minus 42nd power seconds to cross the diameter of a proton."
Google Says so.

The answer to life the universe and everything is 42-Watch Hitchikers Guide to the Galaxy

The zhou dynasty (1046-256 bce) was the longest-lasting of china's dynasties. it followed the shang dynasty (c. 1600-1046 bce) and it finished when the army of the state of qin captured the city of chengzhou in 256 bce.

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.