C. Between E and F and between G and H the elevator could be travelling from a higher floor to a lower floor.
We have to justify all the options with respect to the graph :-
Option A : Between A and B, the elevator would be travelling from a lower floor to a higher floor. Also between C and D, the elevator would be travelling from a lower floor to a slightly higher floor.
So, this option is not correct.
Option B : Between B and C, the elevator wouldn't go higher. And also the same would happen in between D and E.
So, this option is not correct.
Option C : Between E and F, the elevator would be travelling from higher floor to lower and also between G and H.
So, this option is correct.
Option 4 : Between F and G, there would not have much changes. So it will be omitted.
So, this option is not correct.
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