That the murder of Colin Sweeney is unlikely to be seen as an accident by the jury that cannot be confidently stated: the defense presented compelling testimony from the victim's ex-wife stating he was prone to fainting spells and could have easily fallen from the boat without being pushed by someone else.
A. That the murder of Colin Sweeney is unlikely to be seen as an accident by the jury that cannot be confidently stated:
The double that expresses a construction that should not be paused, but we have got the double colomn, and this makes it awkard. The second that is targeting the jury, but it is not the jury that cannot be confidently stated, but the fact that the murder is unlikely to be seen as an accident.
B. That the murder of Colin Sweeney is unlikely to be seen as an accident by the jury that cannot be stated confidently:
Similar to A, the double that is awkard.
C. It cannot be confidently stated that it is unlikely to be seen as an accident by the jury the murder of Colin Sweeney:
Awkard. The first part of the sentence does not provide any subject that is unlikely to be seen as an accidente. The murder of CS is absuderly positioned at the end.
D. It cannot be confidently stated that the murder of Colin Sweeney is unlikely to be seen as an accident by the jury:
Correct one! Here the murder of CS is perfectly modified by the fact "that it cannot be confidently stated". Is unlikely to be seen perfectly targets the murder of CS.
E. The fact that the murder of Colin Sweeney is unlikely to be seen as an accident by the jury that cannot be confidently stated:
Similar to A, the double that ruins the sentence. Here the jury cannot be confidently stated, and even if grammatically it could work, it is senseless.
D is correct