In order to determine which set does NOT contain consecutive integers, you consider first, that an integer is whole number that can be negative, positive, or zero. Consecutive integers will be those ones which are the result of summing or subtracting one unit to the previous number, as for example, -10,-12,-13, or 4,5,6,7, etc.
Then, you can notice that in the first case the numbers 100, 99, 98 are consecutive numbers, each one is the result of subtracting 1 unit to the previous one.
For -11,-10,-9 you have consecutive numbers.
For 10, 11, 12 ypu have consecutive numbers
For 12, 22, 32 you do not have consecutive numbers, because if you sum or subtract 1 unit to 12, you are not going to obtain 22, and so on.