[单选题]
According to the Bohr model of the nnq,)p7 wb m;ratom, the angular momentum of an el /u8qngmvzb /i;(,h iaectron aronhi mv,/u/g zb(8 qai;und the nucleus
A. could equal any positive value.
B. must equal an integral multiple of h.
C. must equal an integral multiple of h/2p.
D. decreases with time, eventually becoming zero.