In paragraphs 9–12 of "puerto rico," what evidence does the author provide for why economic development has been so slow? a. "for more than a century since its acquisition by the united states from spain in 1898 at the conclusion of the spanish-american war, puerto rico has become more and more entwined with the united states of america in all aspects." 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." c. "large and small corporations and privately held businesses crave certainty and stability when looking for sites for their major service and manufacturing facilities." d. "it remains a territory with ambiguous commonwealth status, affording its citizens few of the privileges they deserve."