When we say that a planet has a highly eccentric orbit, we mean that (a) it is spiraling towards the sun (b) its orbit is an ellipse with the sun at one focus (c) in some parts of its orbit it is much closer to the sun than in other

Ithink the correct answer is a

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.