Which of these sets have the same cardinality as the natural numbers: {1, 2, 3, 4, 5, 6, 7, 8, 9, ...} All real numbers
A. {1, 2, 3, 4, 5, 6, 7, 8, 9}
B. {-4,-3, -2,-1, 0, 1, 2, 3,4}
C. Rational numbers
D. Integers {..., -3, -2, -1, 0, 1, 2, 3,...}
E. All positive multiples of 5: {5, 10, 15, 20, 25,...}