The correct option is C 0, 1, 2, 3, 4, 5
When a number is divided by 6, all the numbers less than 6 (0, 1, 2, 3, 4 and 5) are the possible remainders.
When a number is completely divided by 6, the remainder is 0.
Whereas, when a number is not completely divided by 6, the possible remainders are 1, 2, 3, 4 and 5.