Which of the following is not a City Beautiful principle? A. city design that includes open, green park spaces
B.
city design that includes memorials and artistic spaces
C
city design that incorporates classical Greek- and Roman-style architecture
D
city design that develops organically

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.

Migration people get up and go cause they feel it is best for them 

The geographic feature in the westernmost corner of kenya is answer: the great rift vally