If rats are allowed to freely explore a maze without being given a food reward, and later are put in the maze again with a food reward in the goal box, the rats:
a. learn the maze as quickly as rats that have never been exposed to the maze.
b. learn the maze more quickly than rats that have never been exposed to the maze.
c. learn the maze more slowly than rats that have never been exposed to the maze.
d. are unable to learn the maze.