How did legalism lead to the fall of the Qin Dynasty.. A. the gov. creation of strict class system.
b. the gov. reliance on a single ruler left other leaders unpreared to govern in the future.
c. the gov. focus on problems inside china allowed outsiders to invade & overthrow the Qin.
D. the gov. cruel treatment motivated peasants and farmers to join rebel to over throw the Qin dynasty.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Assuming this is a question on a test just name a restaurant by your house and the state you live in, its not too difficult : )