Arrange the following sets in increasing order of cardinality: A. A₁ = {{1, 2}, {3}} B. A₂ = {{1}, {2}, {3}, {4}} C. A₃ = {{1, 2, 3, 4, 5, 6}} D. A₄ = {{1, 2}, {2, 3, 4}, {5}} E. A₅ = {{1}, {2}, {3}, {4}, {5}}

1. AA, B, D, E, C
2. BA, B, E, D, C
3. CA, C, D, B, E
4. DC, A, D, B, E

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Correct answer: D. C, A, D, B, E

Explanation

Count the elements (inner sets): A₃ has 1, A₁ has 2, A₄ has 3, A₂ has 4, A₅ has 5. Order: C, A, D, B, E.