Its B, Because, Present perfect progressive is when you say this, jake has been playing. Past is definitely not, and if past is not it than d wouldnt be it.
Global Warming.
Global warming is the term used to describe the rising of the average temperature on Earth. It has to do with the overall climate of the Earth rather than the weather on any given day. It is melting the ice of Antarctica which will cause the water level to permanently rise causing flood.
Well first you have to figure out what "radiation" means after that you can then do what really makes sense. The answer that I think it is, is D.