If you have an i phone then ask siri what the question is
1) Lowlands area especially level ones are good for human habitation, hence population and settlements Sheldon concentrated here.
2) Coastal lowlands are sources of mineral deposits such as crude oil.
3) Lowlands favour agriculture
4) lowlands favour construction of communication network such as roads, railways, airports, etc.
Answer:
I think it might be the third one... but I'm not sure.
Explanation:
I think k represents gravity because it's the string keeping the ball attached to the pole.
I believe it's b but I may be wrong