Counting occurrences of the digit 9 in numbers from 1 to 100: 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 (which has two 9s). Total is 20 occurrences. Option B (11) only counts the 9s in units place 9, 19, ..., 89. Option C (9) is just one 9. Option D (67) has no relation to the problem.