In what labour officials and lawyers view to be a ground

Quick answer for this one: in general, we want to avoid using "-ing" verbs unless we have a good reason to use them (so, for instance, some was happening when something else happened). E uses a lot of "-ing" verbs without having any reason to do so. Why say labour officials and lawyers "are viewing" the case as groundbreaking? Why not say they "view" it as groundbreaking? Both tell us they currently view it as groundbreaking. And why say the NLB is accusing a company? Why not say the NLB "has accused" the company? Both imply that the accusation occurred in the past and continues into the present.

We find further support when we look at the first sentence, and see that there is no intended meaning that we lose if we don't use "-ing" verbs — the original sentence uses "view" and "has accused".

So we can eliminate E and pick D. Let me know if you'd like clarification on the other answer options as well.