Here is a similar question.
What you confuse is that D matrix represent the path you traveled. The C matrix represent the best probability for that state (t_i) for that word (w_i) (in other, words for all paths). While the D matrix represent how you arrive at that probability.
So, w_5 value is taken from the C matrix, while other values are taken from the D matrix:
- word w_5 best tag is t_1 because the biggest value in C is 0.01 (for t_1)
- word w_4 best tag is t_3 because D matrix at (w_5, t_1) indicates 3
- word w_3 best tag is t_1 because D matrix at (w_4, t_3) indicates 1
- word w_2 best tag is t_3 because D matrix at (w_3, t_1) indicates 3
- word w_1 best tag is t_2 because D matrix at (w_2, t_3) indicates 2
- word <s> best tag is 0 because D matrix at (w_1, t_2) indicates 0
Cheers