`after solving a series of mathematical problems using a complicated formula, mark uses the same formula to solve another problem he could have solved using a much simpler formula. mark's continued reliance on the complicated formula best illustrates which of the following?

a. confirmation bias
b. use of the availability heuristic
c. mental set
d. use of means-end analysis

C. Mental set

Explanation:A mental set is a tendency of using the same solution all over again because it has worked in the past. It is a form of a fixed thinking about resolving problems.

Due to this fixated form of thinking Marks isn't able to use simpler formula to solve his mathematics problems , this mental set is making him fixated to what has worked before.

Why Mental Sets Can Make Problem-Solving More Difficult

- This process prevents us from thinking more creatively because we keep falling back into using the same solution and we don't try new things and it prevent our kind from thinking of new ways to solve problems.

It create rigid thinking and prevent creativity.

c it has to be i googled it