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Question:

Which of the following data structures in Python is considered mutable?

Options:

    
1. Tuple
    
2. String
    
3. List
    
4. Integer

Correct Answer: Option C (List)

Explanation:

In Python, an object is called mutable if its internal state or content can be modified after it is created without changing its identity (memory address).

    
•         Option C (List) is correct: Lists are mutable. You can add, remove, or modify elements in-place using methods such as append(), extend(), or index-based assignment without creating a new object.     
    
•         Option A (Tuple) is incorrect: Tuples are immutable sequences. Once a tuple is initialized, elements cannot be reassigned, added, or removed.     
    
•         Option B (String) is incorrect: Strings are immutable. Any operation that appears to modify a string (such as replace() or concatenation) actually generates and returns a new string object in memory.     
    
•         Option D (Integer) is incorrect: Numeric types (such as int and float) are primitive immutable objects in Python.