Peter is stuck trying to understand some extraneous information with regards to a math problem, and, as such, he finds it difficult to proceed. peters appears to be showing
a. restructuring
b. functional fixedness
c. fixation
d. a mental set

c. fixation              

Explanation:

Fixation: In psychology, the term fixation has been introduced by one of the famous psychologist named Sigmund Freud in 1905 to signify the existence of anachronistic sexual traits. The term fixation demonstrates the object relationships in regards to attachment with things or people that exists from childhood to adulthood.

In the fixation state, a child generally gets stuck in one stage of life where he or she couldn't solve the problem to move ahead. So, the child will remain fixated until the conflict is resolved.

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