[单选题]
According to the Bohr model oipkfy-5bp :pt eqoh.e 6v(94 of the atom,u:tic,q -sn9 m-*osn i the angular momentum of an electron around ,iis-9*cqo-mn un :st 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.