While many of his friends dislike math, Ricky enjoys solving math problems

When asked why, Ricky explains that, unlike many real-life problems, with math problems all of the information you need to solve the problem is given to you, and you know when you have reached the solution. Using the terminology of problem solving, why does Ricky like math problems?
A) They form a clear mental set.
B) They are well-defined problems.
C) They are ill-defined problems.
D) They can be solved by using heuristics.

Answer: B
Rationale: A well-defined problem is a problem that has a clear initial state and goal state.