In an effort to reduce the number of fires started by

Question

In an effort to reduce the number of fires started by cigarettes, a major tobacco company is test-marketing a cigarette  in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing  the rate at which it burns and lowering the heat it generates.

A. in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing
B. in which they use thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows
C. that uses thin layers of extra paper to decrease the amount of oxygen when it enters the cigarette, thereby slowing
D. for which thin layers of extra paper are used to decrease the amount of oxygen that enters the cigarette, and thereby slowing
E. using thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows


so is "in which" okay?

Vict0R · Answer

In an effort to reduce the number of fires started by cigarettes, a major tobacco company is test-marketing a cigarette  in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing  the rate at which it burns and lowering the heat it generates. 

A. in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing => maintains ||ism 

B. in which they use thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which  slows  

C. that uses thin layers of extra paper to decrease the amount of oxygen when  it  enters the cigarette, thereby slowing 

D. for which thin layers of extra paper are used to decrease the amount of oxygen that enters the cigarette,  and  thereby slowing 

E.  using  thin layers of extra paper in decreasing the amount of oxygen enter ing  the cigarette, which slows 

Do u think in D - and therby - is redundant ??

 I will go with A

LM · Answer

yes it is and correct answer should be A. what is OA?

vc019 · Answer

A. in which thin layers of extra paper are used to decrease the amount of oxygen entering the cigarette, thereby slowing 
B. in which  they  use thin layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows –  who “they”? 
C. that uses thin layers of extra paper to decrease the amount of oxygen when it enters the cigarette, thereby slowing 
D.  for which  thin layers of extra paper are used to decrease the amount of oxygen that enters the cigarette, and thereby slowing - "for which" whom?
E.  using thin  layers of extra paper in decreasing the amount of oxygen entering the cigarette, which slows – “marketing …using thin”??

This is how I thought.
B, D & E - Eliminate

Left with A & C

I did like C but A was equally good.
But we have to choose the best answer. In this case it is  A 

Here is how - 
Use of " in which " the cigarette does not use layers of thin paper BUT layers of thin paper are part of a cigarette. Hence we can eliminate C

 Hence A should be the answer.

In an effort to reduce the number of fires started by

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