[单选题]
According to the Bohr model of the atomxe rcv3,wb j,6+hdp +rd ho)v5zc;m /y, the angular momentum of an electron around the nucleum)op/ d ;h5z+dy ch+rvs
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.