In a Laboratory, a Mouse Runs a Maze Faster on the Third

In a laboratory, a mouse runs a maze faster on the third try and even faster on the fifth try. Which of the following describes best what has taken place?

A) The mouse has doubly imprinted the maze.
B) The mouse has first learned the maze and then established its pattern in a fixed behavior.
C) The mouse has learned more about the maze on each trial.
D) The mouse learned the maze on the first three tries and then imprinted what it learned on the fourth try.