Why are bad words bad?​

Other words that are often considered bad relate to negative ways of talking about people and their religion, skin color, ability, gender etc. ... And many people consider those the worst kind of bad words. Often people say bad words when they're experiencing strong emotions, and those words are link to our emotions.

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.