I had to look for the options and here is my answer:
Most scientists conclude that it is the increasing global temperature that leads to the increasing levels of carbon dioxide in the Earth's atmosphere. This may be due to the different chemicals that are being emitted in the air. Hope this helps.
The landform separating the two areas is the Alps, which is a wide range of mountains in central Europe.
One of the major groups which rebelled against the British was the colonists. Their reasons for doing so, include unnecessary taxes, oppressive laws, and just a whole bunch of things related to the fact that Great Britain just wanted to stay in complete control. And the colonists didn’t want to deal with that. They just wanted to have a country to call their own, one that would ruled “of the people, by the people, and for the people”. Hope this helps.
You should just try googling these options. Only one has anything to do with the environment