Many banks have a drive-through automated teller machine, built into the wall flanking the driver's side of a narrow aisle. Even though blind people obviously do not drive, these machines nonetheless invariably feature Braille – the system of raised dots used by the blind for reading and writing – in addition to the standard letters and numerals on their control panels.

Which of the following, if true, does the most to explain the situation described?

a)In most automobiles, the rear windows on the driver's side only roll down about halfway.
b)Moderately visually impaired people who are still allowed to drive typically do not use Braille to read or write.
c)Blind people can often read Braille just as quickly and accurately as sighted people can read regular writing.
d)The embossing technique used to form the raised dots does not typically add much to the overall cost of the automated teller machine.
e)In order to maximize profits per unit, manufacturers produce only a single model of automated teller machine.

This has been the strangest question ever faced by me.

OA
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Can you please explain your choice?
I got this one wrong and thus want to evaluate each and every choice.
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It's a resolve the paradox question and honestly, not very tough if you are quick to connect things from your life together.
What is the paradox?
- Most banks have drive-thru ATMs - you take your car next to the ATM and only the driver's side can access the machine since there is no space for someone to open the door and get down from the car.
- These ATMs feature Braille.

Now obviously, blind people do not drive so why do these ATMs feature Braille? Let's find out what can explain this.

a)In most automobiles, the rear windows on the driver's side only roll down about halfway.
This implies that people sitting behind the driver's seat also cannot access the ATM i.e. only the driver can access the ATM machine. This doesn't help resolve the paradox.

b)Moderately visually impaired people who are still allowed to drive typically do not use Braille to read or write.
If people who are allowed to drive do not use Braille, then we are back at the paradox - why is Braille featured on these ATMs?

c)Blind people can often read Braille just as quickly and accurately as sighted people can read regular writing.
Irrelevant to the argument.

d)The embossing technique used to form the raised dots does not typically add much to the overall cost of the automated teller machine.
Even if a feature doesn't add much to the cost, why would you add it if it has no value? Just because something is cheap, you don't buy it if it is useless for you. If you wear size 6, you won't buy a size 16 just because it is available at 50% off until and unless you are planning to gift to a friend i.e. it has some value for you. Hence, it doesn't help resolve the paradox. It doesn't tell you why Braille is featured at a place where it has no use.

e)In order to maximize profits per unit, manufacturers produce only a single model of automated teller machine.
Doesn't this remind you of something you see on a daily basis? Cars! If you notice, all models of cars except the highest one has blank buttons i.e. buttons that don't do anything. Ever wondered why? Because car manufacturers make one standard interiors model. They have to put buttons for all the features given in the highest end model. In the lower models, you get blank buttons since some features are missing in them. This is the same concept. To maximize profit, only one model of ATMs is made. Braille has to be featured on other ATMs which are not drive through because they are accessed by blind people. Hence all ATMs feature Braille whether they are put in drive thrus or in regular kiosks. This resolves our paradox.

Answer (E)
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There was a gap in understanding. To use Braille, you need to use the same buttons as used by regular people. Since windows roll down only half way, you can't reach the buttons.
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The wording should make you aware of a trap. 'windows roll down ONLY half way...'. It kind of implies that the ATM isn't exactly within reach of a person sitting next to the rear window on the driver's side.

If the logic were that blind people sitting behind the driver need to operate, the option would have said something like 'the ATM can be easily accessed by the person sitting next to the rear window on the driver's side'

I hope the correct option makes sense now.
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Wow. So I am not crazy for thinking that way-cool!