Ace Your C++ Skills 2026 – Rock the ‘Thinking in C++’ Challenge!

When a pure virtual function is not overridden in a derived class, the derived class inherits the pure virtual function from its base class. Since the derived class does not provide an implementation for the pure virtual function, the derived class itself becomes an abstract class and cannot be instantiated. This means that any attempt to create an object of the derived class will result in a compilation error. Additionally, if the derived class is not made abstract by providing implementations for the pure virtual function, it will result in a run-time error when the program tries to access the pure virtual function through an object of the derived class. Therefore, the only correct option is A.