[单选题]
According to the Bohr model of the a3g2o5c: brr mi(xe)dntom, to5ov0 m+wk 2vmhe angular momentum of an electron around theo02w5ov mmv+k 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.