What describes the requirement for Group A's change of type of feature?

The correct answer illustrates that for Group A's change of feature type, it is mandatory to include a minimum of two different types of features. This requirement emphasizes the diversity and complexity that is often sought in synchro skating routines, which aim to showcase different elements and skills. By incorporating multiple feature types, a team can effectively demonstrate their versatility and execution ability. This not only enhances the overall performance but also adheres to judging criteria that reward variety in a program's elements.

In this context, while some alternatives suggest including the same feature type or not having specific types, these do not align with the requirement to showcase varied skills and elements, which is crucial for achieving a well-rounded and competitive performance. The necessity of having distinct feature types helps to elevate the complexity and artistic merit of the routine, making it more appealing to judges and audiences alike.