157.The underlined it directly refers to .....
As we understand the brain in greater detail, we are able to develop drugs that stimulate it. This has proven a life-saver for the millions of people with attention deficit disorder, and could be a tremendous breakthrough for those suffering from Alzheimer’s disease.
It could also, however, be of great use to normal people. If a pill could improve your memory, focus and concentration – why not take it? This also leads to a slippery slope. You can imagine a workforce where it is the culture to take performance enhancers routinely, and your boss yelled at you if you didn’t do so as well.
This pressure to take pills for focus is already intense at the best schools. Spend time in the library at any top college, and you will overhear students talking about using pills like Adderall for better focus and attention.
I would pick ( b). The closest single antecedent is "this," the subject of the second sentence.
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soheil1As we understand the brain in greater detail, we are able to develop drugs that stimulate it. This has proven a life-saver for the millions of people with attention deficit disorder, and could be a tremendous breakthrough for those suffering from Alzheimer’s disease.It could also, however, be of great use to normal people.'This', at the beginnin
fivejedjon soheil1As we understand the brain in greater detail, we are able to develop drugs that stimulate it. This has proven a life-saver for the millions of people with attention deficit disorder, and could be a tremendous breakthrough for those suffering from Alzheimer’s disease.It could also, however, be of great use to normal people.'This', at the beginning of the