C B and A Hope this helps!!!!
The answer B.Since,Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. ... Diffusion in gases is quick because the particles in a gas move quickly. It happens even faster in hot gases because the particles of gas move faster.
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Speaking of urgency, impulse purchases only happen when you can create a sense of it in customers' minds. Impulse buys generally draw on one of two things: Shoppers' wants or. Staple items.
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The author thinks that the students are to improve in their writing skills also, to help build them up and boost the spirit of a good writing in them.
