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?
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AIn most automobiles, the rear windows on the driver's side only roll down about halfway.
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BModerately visually impaired people who are still allowed to drive typically do not use Braille to read or write.
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CBlind people can often read Braille just as quickly and accurately as sighted people can read regular writing.
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DThe embossing technique used to form the raised dots does not typically add much to the overall cost of the automated teller machine.
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EIn order to maximize profits per unit, manufacturers produce only a single model of automated teller machine.
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正确答案: E