I did the same question but chose:
The Field Mouse
Storm on the Island
Patrolling Barnegat
Sonnet
The latter two were my strongest poems and easy to write about but I don't know why I went for Storm on the Island. I did get some comparisions about destruction of the land and how barren it is. However, in my conclusion, I made up some whacko of a personal response stating how The Field Mouse and Storm on the Island were indicators of the damage of war and that the raw power, as displayed in Patrolling Barnegat, and the admiration for it could cause such disaster. I then went onto say that Sonnet was the only form of peace and that it stuck out from the other three...
(Yeah...Even I don't rate my chances highly!)
I hope the examiner like waffle...I'm sure he/she gets enough of it anyway