The British army was trapped at Yorktown by: A. An army led by Friedrich von Steuben.
B. A fleet of Spanish warships.
C. A fleet of French warships and 16,000 Patriot soldiers.
D. Guerrilla fighters led by Francis Marion.

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.