How did Rome's fall contribute to the rise of feudalism in Europe?

Middle AGES: Europe AFTER THE FALL OF ROME

Because kings were often too weak to repel the invaders, many city dwellers moved into the countryside in hopes of greater safety. As a result of the invasions, and a weak central government, a new social and political system known as feudalism developed

Explanation:

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radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

the correct answer is b