1 (a)

2(e)

3(e) though it's hard to know what newspaper companies believe...an economist would certainly point to (d) as an important part of the answer.
 
4(d) though e is pretty tempting...in fact, (e) and (a) are really much the same thing.  When one uses the colloquial expression "Get a life!" one usually means to say "You could be making better use of your time and energy than spending so much of it on this!" and that's really about considering the opportunity cost.
 
5(b) though some people would argue for (e).

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