Total number of subsets that can be formed with the left of 11 elements =211=2048 The number of subsets which contain only odd numbers(1, 3, 5, 7, 9, 11}=26=64 Number of subsets which contain at least one even integer = Total number of subsets - the number of subsets which contain only odd numbers ⇒2018−64=1984 Hence, option C is the correct answer