To reduce the chance of an accidental dig-up, plastic warning tape should be placed a MINIMUM of _________ below grade, but high enough above cables to allow detection before cables are damaged.

To reduce the chance of an accidental dig-up, plastic warning tape should be placed a MINIMUM of _________ below grade, but high enough above cables to allow detection before cables are damaged.
A . 101 mm (4 in)
B . 203 mm (8 in)
C . 300 mm (12 in)
D . 381 mm (15 in)
E . 457 mm (18 in)

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Answer: C