H.264 encoding, the main reason for blocking is () (single choice)

H.264 encoding, the main reason for blocking is () (single choice)
A . The macro block is in the intense motion area, the difference is big, resulting in obvious edges
B . The quantization level of the coding block jumps, resulting in sudden brightness changes at the boundary
C . Unreasonable division of macroblock coding modes, resulting in false edges
D . Deblocking filter (Deblocking) is not strong enough, resulting in not smooth edges

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Answer: B