[单选题]
For a diatomic quantum mechanict.uof tg1nq)vi3m9; i al wapu (rv ; 4o5cdduc.q8 ,n2stvibrator, the energy difference between adjacent quant(c4s5 ud nvqopd;,8uc.r2atwum states
A. increases as v increases.
B. decreases as v increases.
C. is constant for all values of v.
D. varies randomly as v increases.