[单选题]
The reason the position of a particle cat+il 35xac tu0nnot 3h59r;6,k zu go loeiwhcw 2nta 19x7ube specified with infinite precision is thzlu 6 c,;2g k ra7howx 95uon93ti1ehwe
A. exclusion principle.
B. uncertainty principle.
C. photoelectric effect.
D. principle of relativity.
