Please help me in solving this problem

Problems 17 through 20 refer to the following preference schedule. 10 6 5 4 2 C D A B A B D A C A B D D C C A 17. Determine which candidate (A, B. C, or D) wins the election using the plurality method. 18. Determine which candidate (A, B, C, or D) wins the election using the Borda count method. 19. Determine which candidate (A, B, C, or D) wins the election using the plurality-with- elimination method 20. Determine which candidate (A, B, C, or D) wins the election using the method of pairwise comparisons