[单选题]
According to the Bohr model of the atom, the angular momentum13vhr t0tba4fhnwa* 7 of an electroxj16rm w(c-cpn around the nucleus xwr6j1p- mcc(
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.