Disclosure TC31 SC

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.>

(B)both sides are intent on creating difficulties for each other

(C)each side is intent on creating difficulties for the other

BとCで迷った末、Bを選んだのですが、不正解でした。
この違いを教えていただける方がいましたらよろしくお願いします。