The problem the corporation is dealing with is animals getting in the way of the helicopter launching pad. At present the culprits are the geese. If we bring in herding dogs to keep the geese away from the helipad that would be a great solution...unless the herding dogs get in the way of the helipad. And how can that happen? Well, if the dogs are uncontrollable and run around everywhere.
(A) speaks directly to this. So it is the answer.
(E) does NOT undermine the plan. Remember: the plan is to keep the helipad clear. If some geese go running off to another pond then they are clearly not blocking the helipad. If (E) were the case, it would strengthen the plan of bringing in herding dogs to keep geese away from the helipad.
Hope that helps
Magoosh Test Prep