Found a pattern. It belongs to the expansion of graphic changes in grade one, a variant problem;

Count to a certain value first, and you will find that the values of A are 1, 7, 13, 19 ... all 6, and D is 4, 10, 16, and 6.

1 4

7 10

13 16

19 22

1+6(n- 1)4+6(n- 1

201/6 = 33.5,33x6+1=199,201-199 = 2, so it is C.

You got it?