[单选题]
According to the Bohr model of the atom, t 4*)yzcyjd9gohen ;/o9efjm. he angular momentum of an electron adrs )*,yuryh/je h 0v1g+2wyiround theyr/y0+swu,v hr2ydgh)* 1 ej i 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.