Student senior(); is a(n)_________

constructor call with no arguments
object instantiation
constructor call with all default arguments
prototype for a function that returns a student object

The correct answer is: A. constructor call with no arguments.

A constructor is a special type of function that is used to create objects. When you create an object, you call the constructor for the type of object you want to create. The constructor takes arguments that specify the values for the object’s properties.

In the case of the Student class, the constructor takes no arguments. This means that when you create a Student object, you do not need to specify any values for the object’s properties. The constructor will set the object’s properties to default values.

The other options are incorrect because:

  • Option B is incorrect because object instantiation is the process of creating an object. In the case of the Student class, object instantiation is done by calling the Student constructor.
  • Option C is incorrect because a constructor call with all default arguments is a special case of a constructor call with no arguments. In the case of the Student class, there are no default arguments, so there is no such thing as a constructor call with all default arguments.
  • Option D is incorrect because a prototype for a function that returns a student object is not a constructor call. A prototype is a declaration of a function, not a call to a function.