[单选题]
For a diatomic quantum mechanical t/et / b al,cv6 4su7a(z+nwgcvibu -2kefbggxki+o* y5 5rator, the energy difference between adjacent quantum st5xky-+figog 2bku 5e *ates
A. increases as v increases.
B. decreases as v increases.
C. is constant for all values of v.
D. varies randomly as v increases.