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Because learned patterns of behavior, such as the association of a green light with “go” or the expectation that switches will flip up for “on,” become deeply ingrained, designers should make allowances for that fact, in order not to produce machines that are inefficient or dangerous.

In which one of the following situations is the principle expressed most clearly violated?

(A) Manufacturers have refused to change the standard order of letters on the typewriter keyboard even though some people who have never learned to type find this arrangement of letters bewildering. - WRONG. No change in order of letters on the typewriter is non-violation.

(B) Government regulations require that crucial instruments in airplane cockpits be placed in exactly the same array in all commercial aircraft. - WRONG. 'Exactly' suggests that there's no other way of placing the instruments. No violation.

(C) Automobile manufacturers generally design for all of their automobiles a square or oblong ignition key and a round or oval luggage compartment key. - WRONG. 'Generally' suggests non-violation.

(D) The only traffic signs that are triangular in shape are “yield” signs. - WRONG. So, basically there's no other way around for that sign. It signifies universality, hence this one does not violates.

(E) On some tape recorders the “start” button is red and the “stop” button is yellow. - CORRECT. 'Some' suggests that there are others that have different arrangements.

Answer E.
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