Which of the following statements about the monroe doctrine is not accurate? a.)the united states would not allow the nations of europe to establish new colonies in the americas.
b.) it called for european nations to grant independence to all of their colonies in the americas.
c.) if necessary, the united states would use military force to prevent european interference in the americas.
d.)any attempt by a european country to establish a new colony in the americas would be viewed as a threat to the peace and safety of the united states.

B.) It called for European nations to grant independence to all of their colonies in the Americas ie it did not do this. Once the US independence was achieved from the British, sometime in the 1800's, it became US policy to consider the countries of Latin America (many of which had already achieved independence from Spain and Portugal) to be its' backyard and therefore subject to military intervention if the policies of these countries did not favor the US such as in trade and the US did not allow other for example European powers to have much influence there. 

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.