Whenever some sort of middle ground is sought

Whenever some sort of middle ground is sought to be created through track-two diplomacy it is attacked by pre-establishment forces on either side.

A. Whenever some sort of middle ground is sought to be created through track-two diplomacy it is attacked by pre-establishment forces on either side.
B. Whenever some sort of middle ground is sought to be created through track-two diplomacy it is attacked by pre-establishment forces on both the sides.
C. Whenever some sort of middle ground is sought to be created by track-two diplomacy, it is attacked by pre-establishment forces on both sides.
D. Each time some sort of middle ground is seen to be created through track-two diplomacy it is attacked by pre-establishment forces on either side.
E. Each time some sort of middle ground is sought to be created through track-two diplomacy, it is attacked by pre-establishment forces on either side.