Warmth judgments on nearness to a solution prior to the solution of an insight problem and prior to the solution of a non-insight problem.
a) gradually rise; gradually rise
b) gradually rise; rise suddenly just
c) rise suddenly just; gradually rise
d) vary unpredictably; vary unpredictably

Warmth judgments on nearness to a solution rise suddenly just prior to the solution of an insight problem and gradually rise prior to the solution of a non-insight problem.

Option c

The examinee is required to shift his/her perspective to a novel way to achieve the solution in insight problems. The three types of insight problems are: mathematical, spatial, and verbal. They are totally based on the perspective of the person and how good they  can process the information thinking in a different way.

Non insight problems are  solved through systematically applying the knowledge through logical deduction of the individual, and does not require novel thinking. Also, the warmth judgement on nearing to a solution rise suddenly just prior to the solution of an insight problem and gradually rise gradually prior to the solution of a non insight problem.