People often find it difficult to solve a problem by using a familiar object in a novel way because of

A) a mental set.
B) unnecessary constraints.
C) irrelevant information.
D) functional fixedness.

Functional Fixedness

A cognitive bias that limits a person’s ability to use an object only in the way it is traditionally used.

Mental Set

A psychological tendency to approach situations in a certain way due to past experiences or habits, which can limit problem-solving abilities.

Unnecessary Constraints

Limitations or restrictions that are not required and can hinder creativity, progress, or the achievement of goals.