Which three dimensional figure matches this net

B is the right answer.

The net makes a cube, since all of the faces are squares and there are 6 of them.
If you don't believe me, you can always make the net on paper, cut it out, and see what figure you get.

Hope this helps!

The name may be in importnce  to them

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.