Five friends are standing in a row and all facing North.
Tony is not adjacent to Bony or Mony. Sony is not adjacent to Bony.
Tony is adjacent to Dony. Dony is at the middle in the row.
Then, which pair is at the extreme ends of the row ?

It is given that Dony is at the middle of the row. So, he can't be at the extreme of the arrangement. Hence, all the options which contains Dony can be eliminated (Option A, B and C). 

It is also given that Tony is adjacent to Dony. Which means that Tony can't be at the extremes as Dony is in the middle of the arrangement. 

Hence, we can also reject the condition is which it is given that Tony is at the extremes (Option D). 

So, the only option left is Option E. Which means that, Sony and Mony will be at the extremes.