If a crate of 20 oranges cost k45, what will 60 oranges cost​

Well, a and b together would be negative. b alone would also be negative.

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.

I’m guessing probably a