1), according to the probability formula of random simple sampling P=n/N, the number of female students in senior two can be obtained;

2), from (1) can get the number of first and second grade;

3), calculate the number of third grade = total number-(number of first grade+number of second grade);

4), and then according to the proportional formula of stratified sampling:

Sample size/population = number of samples per floor/total number of floors, and the number of junior three students can be obtained.

The answer process is as follows:

∫ 1 person is selected, and the probability of drawing a second-year girl is 0. 19.

∴P=ⅹ/2000=0. 19，

∴x=380，

So the number of students who can get the third grade is:

2000-(373 ten 377 ten 380 ten 370)=500,

So the total number of students is 64, of which the number of third-grade students is:

m/500=64/2000，

∴m=64x500/2000= 16。

So the answer should be: C.