For what maximum outside diameter may a radiographic technique be used in which the radiation passes through two walls and the weld in both walls is viewed for acceptance?

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For what maximum outside diameter may a radiographic technique be used in which the radiation passes through two walls and the weld in both walls is viewed for acceptance?
A . 1.5 in. (38.0 mm)
B . 2.5 in. (63.5 mm)
C . 3 in. (76.2 mm)
D . 3.5 in. (90.0 mm)

Answer: C