How are gravitational, magnetic, and electrostatic forces different from mechanical friction and spring forces?

This attractive force is known as an electrostatic force. If objects both have the same charge, they repel (or push away from) each other. ... If no other forces are involved, moving objects on Earth slow down because of friction. The cause of friction is the rubbing together of two surfaces.
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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.