Marilyn was asked to solve a series of five math problems. the first four problems could only be solved by a particular sequence of operations. the fifth problem could also be solved following this sequence; however, a much simpler solution was possible. marilyn did not realize this simpler solution and solved the problem in the way she had solved the first four. her problem-solving strategy was hampered by:
a. functional fixedness
b. the overconfidence phenomenon
c. mental set
d. her lack of a prototype for the solution

They are correct!

Explanation: C) Mental Set

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you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.