GMAT Critical Reasoning (CR) | Most small children are flat-footed

Most small children are flat-footed. This failure of
the foot to assume its natural arch, if it persists past
early childhood can sometimes result in discomfort
and even pain later in life. Traditionally, flat-footedness
in children has been treated by having the children
wear special shoes that give extra support to the foot,
in order to foster the development of the arch.

Which one of the following, if true, most calls into
question the efficacy of the traditional treatment
described above?

(A)
...

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