This one needs a severe rethink. Only two out of four groups make any sense, and the other two are worded in such a way that even if you give the right answer, they're going to be marked wrong. Would recommend the writer goes back and edits this grid, or many people will miss out on a full 10/10.

Solved in 16 secs, very easy, but 2 of your categories are poor and very narrow in terms of what definition they'll take

Net Com Ca Org are what is called top level domains. That should be an acceptable answer. Coal Petroleum etc is not a good group/answer