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1. \(A \subset B\text{.}\)

2. \(B \subset A\text{.}\)

3. \(B \in C\text{.}\)

4. \(\emptyset \in A\text{.}\)

5. \(\emptyset \subset A\text{.}\)

6. \(A \lt D\text{.}\)

7. \(3 \in C\text{.}\)

8. \(3 \subset C\text{.}\)

9. \(\{3\} \subset C\text{.}\)