When the sunni and shiite split, the sunnis argued that a. all new caliphs should be elected by the people b. there should not be a caliph c. all new caliphs should be related to muhammad by blood d. there should be a caliph for each muslim city

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.

Ithink the best answer is d increased stability of all other biomes