Bunuel
One perplexing result of General Relativity is the prediction that gravitational singularities lie at the hearts of black holes, a point where the laws of physics no longer seem to apply, and that has been supported by subsequent research.(A) One perplexing result of General Relativity is the prediction that gravitational singularities lie at the hearts of black holes, a point where the laws of physics no longer seem to apply, and that has been supported by subsequent research.
(B) One perplexing result of General Relativity is the prediction at the heart of each black hole of a gravitational singularity, a point at which the laws of physics no longer seem to apply, but a prediction that has been supported by subsequent research.
(C) One of the perplexing results of General Relativity is the prediction, supported by subsequent research, that at the heart of each black hole lies a gravitational singularity, a point at which the laws of physics no longer seem to apply.
(D) The prediction of a gravitational singularity at the heart of each black hole, a perplexing result of General Relativity but one that is supported by subsequent research, is a point where the laws of physics no longer seem to apply.
(E) The prediction that at the heart of each black hole lies a gravitational singularity, a point at which the laws of physics no longer seem to apply, is a perplexing result of General Relativity but supported by subsequent research.
(A) One perplexing result of General Relativity is the prediction that gravitational singularities lie at the hearts of black holes, a point where the laws of physics no longer seem to apply, and that has been supported by subsequent research.
--> It incorrectly suggests that the heart of black holes have been supported by subsequent research - misplaced modifiers
(B) One perplexing result of General Relativity is the prediction at the heart of each black hole of a gravitational singularity, a point at which the laws of physics no longer seem to apply, but a prediction that has been supported by subsequent research.
--> This incorrectly suggests that the prediction was made at the heart of the black hole
(C) One of the perplexing results of General Relativity is the prediction, supported by subsequent research, that at the heart of each black hole lies a gravitational singularity, a point at which the laws of physics no longer seem to apply.
--> Awkward since the statement suggests that the prediction is awkward and without any contract words it uses a modifier to slip in the research phrase
(D) The prediction of a gravitational singularity at the heart of each black hole, a perplexing result of General Relativity but one that is supported by subsequent research, is a point where the laws of physics no longer seem to apply.
--> Incorrectly suggests that the prediction is a point and not the black hole
(E) The prediction that at the heart of each black hole lies a gravitational singularity, a point at which the laws of physics no longer seem to apply, is a perplexing result of General Relativity but supported by subsequent research.
--> Correct
'but' correctly identifies the contrast between perplexing result and research support
IMHO Option E