B. Stationery is the answer.
A. and C. aren't actual words and D. is an adjective referring to something that doesn't move, and is in one spot. Only B. is a noun that refers to office equipment.
C An essay giving reasons by streelight should be installed it giving you reasons and informing you why
It's often futile to try to convince people that they should adopt a particular political position, but if you try, make sure to appeal to logic. Try to eliminate as much emotion from your argument as possible.
I believe the answer is B. Nguyen explains how buses reduce traffic by lowering the number of cars on the road.
The passage says “Clearly, buses reduce traffic rather than cause it”. Answer B is the only answer that mentions traffic in a logical way.
I hope this helps!