A person trying to open a package uses a knife but struggles because the packaging is sealed with thick plastic. They don't consider using their keys, which are equally sharp and available, to cut the plastic. This failure to see alternative uses for an object is an example of which cognitive bias?
✓ Correct Answer: Option C
Functional fixedness is a cognitive bias that limits a person to using an object only in the way it is traditionally used, hindering their ability to imagine alternative uses for problem-solving.