Answer:
E) Super Bowl
Explanation:
For computing the lowest CPM we need to do the following calculations
                                    (a)                                  (b)                           (a ÷ b)
Particulars                  U.S. national edition   U.S. audience size   CPM
Wall streel Journal     $327,897                    $1,566,027                  20.94%
USA today                   $207,720                   $1,711,696                    12.14%
Bloomberg
Businessweek             $148,300                    $900,000                   16.48%        
Sports Illustrated         $396,600                   $3,000,000                13.22%
Super Bowl telecast     $3,800,000              $108,400,000          3.51%
As we can see from the above calculations that the super bowl has the lowest CPM 
hence, the option E is correct