Answer:
B- FUNCTIONALITY FIXEDNESS
Explanation:
Functional fixedness means to use a particular thing only in the way it has been used which limit problem-solving capabilities and creativity idea of the person.
Functionality fixedness also means inability to know that something known to have a particular use may also be used to perform other functions whereby people can't see beyond the usual functions of something.
Because the person may only perceive the object in terms of its most common use.
Therefore Ben has overcome the problem-solving difficulty of FUNCTIONALITY FIXEDNESS by thinking outside the box.