[单选题]
The probability of findi)b6asnj md b98ng an electron in a hydrogen atom is directly proportio/ g5xiobq gvxegce 6cvf e/+f(91pc.+nal toc 5g .g/x9/ +(vee1xcq evf co+gf6bpi its
A. energy.
B. momentum.
C. wave function.
D. square of the wave function.
