Which Design Pattern should I use for the following situation?

I need to decide how to create an elegant solution for the following problem.

• I receive a list of "ClassA" objects.
• I have an interface and four different implementations.
• The interface method uses a class "ClassA".
• ClassA has PropertyB and PropertyC.
• Depending of the value of PropertyB I want to decide which implementation of the interface should I use for each object of the List.

I need an elegant solution but I can't think of any.

Does anybody has any idea if how can I implement this? An advice of which Design Pattern should I study?

Thanks in advance.