An access component is needed if the difference in platform height is more than ____ for school-age children.

12 inches

18 inches

The other options are incorrect because they show a platform height that is either lower (A and C) or higher (D) than the recommended difference for school-age children. An access component is only needed if the difference in platform height is more than 18 inches for school-age children. This is because a difference greater than 18 inches can pose safety and accessibility concerns for young children.

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20 inches

30 inches

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