<span>B. "To date, few companies based in the United States have been willing to explore their options in Puerto Rico because of the high level of uncertainty about our political status, labor policy, and tax code compliance."
Options A and D should be eliminated immediately. They do not give a direct reason for slow economic development. Option C further develops option B. It states what companies are looking for, but does not say that Puerto Rico lacks these things. Option B states exactly what Puerto Rico is lacking which results in slow economic development.
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<u><em>Your answer should be the choice</em></u><u><em> "B".</em></u>
I don't believe that any of these are run-on sentences. This is because they all possess some form of punctuation, which creates a small to moderate oause in the sentence, allowing for the person reading to breathe in between, and preventing a run-on sentence.
