Which cultural group once preserved food by burying kimchi pots underground during the winter?

Plz put the answer choices thx.

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.

What are we gonna edit

Нет, нужен трамвай, аэропорт, приют. я предлагаю обществу общественной помощи.