After defining a class you can instantiate one or more . . . . . . . .

Objects
Classes
Attributes
Methods

The correct answer is: A. Objects

After defining a class, you can instantiate one or more objects. An object is an instance of a class. It is a concrete representation of a class. Objects have state and behavior. The state of an object is represented by its attributes. The behavior of an object is represented by its methods.

Option B is incorrect because a class is a blueprint for creating objects. It defines the attributes and methods that objects of that class will have.

Option C is incorrect because an attribute is a property of an object. It is a piece of data that describes the object.

Option D is incorrect because a method is a function that is associated with an object. It is a piece of code that performs an action on the object.