Because it could not govern effectively after the reign of terror, the directory had to "disband," which led to a massive power vacuum that was eventually filled by the dictatorship of Napoleon.
A physical change chamges the substances apperance, but a chemical changes the chemical formula of a substance. Hope this helps!
The correct answer is C - res publica.
The res publica were a class of people which we would today consider to have been the early aristocrats of Early Rome. Later on, the class of wealthy romans and those who had power were called the patricians.