What will happen when executing the casts in the provided ABAP code?

When analyzing the ABAP code and considering the dynamics of object casting within the inheritance hierarchy, the correct choice indicates that the first casting attempt will be successful while the second will not.

In more detail, when you perform CAST #( go_super ) to go_sub1, it is expected to work if go_super is a reference to an object of a superclass type that matches the requirements of go_sub1 - a subclass of that superclass. This implies that the actual object being referenced must indeed be an instance of a class that fits into the expected type of go_sub1.

However, when attempting to execute CAST #( go_super ) to go_sub2, it indicates that the type of go_super is not compatible with go_sub2. This scenario typically occurs if go_super does not reference an object that can be treated as an instance of the class represented by go_sub2. Consequently, this casting would lead to a runtime error, thereby confirming that the second part of choice B would not work as expected.

Thus, this indicates a clear understanding of the type hierarchy and casting functionality in ABAP, demonstrating that appropriate subclass types must be used when performing casts within an inheritance structure.