[单选题]
The reason the position of 3mp9 z -,kdrbu1g)f 6aqjn+mz a particle cannot be specified wig/qdi m 7 yuqu*.r:xldz8w:g,th infinite precision is xq: : u,8r/ mi7zd.d w*ygulgqthe
A. exclusion principle.
B. uncertainty principle.
C. photoelectric effect.
D. principle of relativity.