Which of the following statements are true ?
` { a} sub {a,b,c,} `

Answer

To determine whether the statement \( A \subseteq \{A, B, C\} \) is true, we will analyze the definition of a subset and the elements involved.

### Step-by-Step Solution:

1. **Understanding the Statement**:
The statement \( A \subseteq \{A, B, C\} \) means that set \( A \) is a subset of the set containing elements \( A, B, \) and \( C \).

2. **Definition of Subset**:
A set \( X \) is a subset of a set \( Y \) (denoted as \( X \subseteq Y \)) if every element of \( X \) is also an element of \( Y \).

3. **Identifying Elements**:
In this case, we need to identify what elements are in set \( A \) and in the set \( \{A, B, C\} \).
- If we assume \( A \) is an element (not to be confused with the set itself), then the set \( \{A, B, C\} \) contains three elements: \( A, B, \) and \( C \).

4. **Checking the Subset Condition**:
For \( A \) to be a subset of \( \{A, B, C\} \), every element of \( A \) must be found in \( \{A, B, C\} \).
- If \( A \) is considered as an element, then it is indeed present in the set \( \{A, B, C\} \).

5. **Conclusion**:
Since the only element of set \( A \) (assuming it is just the element \( A \)) is present in the set \( \{A, B, C\} \), we can conclude that the statement \( A \subseteq \{A, B, C\} \) is true.

### Final Answer:
The statement \( A \subseteq \{A, B, C\} \) is **True**.