[单选题]
According to the Bohr model of then-k /vdf /m)xw atom, the a/d8 cq60f +dwt3zv9(guwo uld ngular momentum of an electron around the nucleusddo8 9w6tcd+guu3qz(0/v flw
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.