I am still confused about what is wrong in A and B....

...can someone please explain
Does the word 'other' and 'each other' in option A and B refer to third parties?...also is the word 'both' referred incorrectly in both A and B?...are these the reasons for A and B to be wrong?
The complex tax dispute between the Covered Bridge Mall and Harris Township is not likely to be adjudicated for several years, and, in the meantime,
both sides are intent on creating difficulties for the other.
A. both sides are intent on creating difficulties for the other
B. both sides are intent on creating difficulties for each other
C. each side is intent on creating difficulties for the other
D. each side is intent on creating difficulties for
one another - one another should be used for a group of more than 2 people or things
E. the sides are both intent on creating difficulties for each other - awkward