What is polymorphism in object-oriented programming?

• A. The ability of a variable to hold different data types
• B. The ability to create multiple classes in one file
• C. The capability to call the same method on different objects
• D. The practice of storing data in a hierarchical structure

Answer: (C)

Polymorphism in object-oriented programming refers to the capability to call the same method on different objects, allowing the method to behave differently based on the object that invokes it. This means that a single function or method can operate on objects of different classes, and each class can provide its own implementation of that method.

For example, consider a base class Animal with a method speak(). Derived classes like Dog and Cat can each implement the speak() method differently, where Dog might return "Bark" and Cat might return "Meow". When you call the speak() method on an instance of either Dog or Cat, the result will depend on the type of object, showcasing polymorphism.

This feature increases the flexibility and reusability of code, as new classes can be introduced with their own implementations without altering the code that uses the polymorphic method, facilitating easier updates and maintenance.

While other options touch on related concepts in programming, such as data types, file organization, and data structure, they do not accurately define polymorphism as it specifically pertains to method overriding and the dynamic response to method calls based on the object's class. Polymorphism