What is the outcome if you try to modify a tuple in Python?

In Python, tuples are immutable, which means once they are created, their elements cannot be modified. This characteristic ensures that the data contained within a tuple remains constant throughout its existence. Therefore, if an attempt is made to change an element of a tuple—whether that involves reassignment of an existing element or adding new elements—a TypeError will be raised, halting the execution of the program and indicating that tuples do not support item assignment.

This rigidity in tuples is beneficial in scenarios where a constant set of values is needed, providing integrity and stability throughout the program. Because of this fundamental property, option B is indeed the correct outcome when attempting to modify a tuple in Python.