Choose the best experimental design to test the question "Does the gender of mice affect the time it takes to learn mazes?"
Time six male mice and six female mice in the same maze; reward the male mice with fruit when they complete the maze,
and reward the female mice with grains when they complete the maze.
Time six male mice and six female mice in the same maze; reward both male and female mice with fruit when they
complete the maze.
Time six male mice in one maze and six female mice in a second similar maze; reward both male and female mice with
cheese when they complete the maze.
Time each mouse in a different maze; reward the male mice with bread when they complete the maze, and reward the
female mice with cheese when they complete the maze.