Two cups of the same size are filled to the brim with clear liquids. Cup A holds water. Cup B contains alcohol. Your teacher challenges you to figure out which cup holds water. Because of your great scientific knowledge, you know that all substances have their own special properties. First, you waft (carefully smell) the two liquids. What property are you checking when you waft?

A) color
B) odor
C) taste
D) texture

If you smell or waft the substance you would be checking for B) odor

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.