"About twenty-five percent of Rome’s population was enslaved" is the statement among the choices given in the question that <span>best describes slavery in ancient Rome. The correct option among all the options that are given in the question is the second option or option "B". I hope it helps you.</span>
<span>I think he probably meant that the Constitution is not to be set in stone and should change to fit the times, which is my the Founding Fathers put in the Amendment process.
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"A constitutional door is left open" refers to the question of whether an action is constitutional or unconstitutional. There is gray area that needs to be discussed.