What is the definition of 'head entrapment' as used in ASTM F1487?
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A
Any opening that could trap a child's neck
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B
An opening between 3.5 and 9 inches where a child's head can enter but cannot exit
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C
An opening under 3.5 inches where a child's head cannot enter at all
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D
An opening over 9 inches that traps an entire body