Final answer:
Both A and B are correct. The block deck of a cylinder block should be checked for warpage, and minor imperfections can be removed.
Step-by-step explanation:
Both A and B are correct. When inspecting a cylinder block after hot tanking, it is important to check the block deck for warpage using a straightedge and a feeler gauge. This helps ensure that the surface is flat and within tolerance. Minor nicks or burns on the block deck can be removed using a whetstone or a file. These tools can remove any imperfections and create a smooth surface, allowing for proper sealing.