题目选项分析

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?

【选项】In order to maximize profits per unit, manufacturers produce only a single model of automated teller machine.