Answer:
The answer to the Governor Bentley question is:
Unfortunately, Governor Bentley never provided any clarification about
that vital state issue.
Explanation:
The sentence that would provide the most coherence with the original sentence is the following one: Unfortunately, Governor Bentley never provided any clarification about that vital state issue. This sentence provides coherence by directly referring to words from the first sentence--most notably, the word "clarification"--and by using pronoun to refer to "that issue."