4) C

A – Wrong
The text just says to fight spam at the source. It does not suggest that it is always better to fight problems at the source

B – Wrong
the text does not make any comparison between reducing spam and easing congestion on the road. So we cannot conclude which one is a higher priority. 

C – Correct
This discusses the link made between spam and global warming. Also, the second line of the text suggests that reducing spam can take off 2.3 million cars off the road, meaning less global warming.

D – Wrong
This does not discuss the link made between global warming and spam. 

E – Wrong
‘Never’ is too strong and also, global warming is not mentioned in this statement

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