Natural discontinuities comparable in size to the penetrameter holes shown on a radiograph may not be detected because:

Natural discontinuities may contain less dense material than the penetrameter holes

Natural discontinuities may be thicker than the penetrameter holes

Natural discontinuities do not necessarily have as sharp edges as the penetrameter holes

Natural discontinuities comparable in size to the penetrameter holes s

1.	Natural discontinuities comparable in size to the penetrameter holes shown on a radiograph may not be detected because:
A.	Natural discontinuities may contain less dense material than the penetrameter holes
B.	Natural discontinuities may be thicker than the penetrameter holes
C.	Natural discontinuities do not necessarily have as sharp edges as the penetrameter holes
D.	All of the above
Answer» D. All of the above