What was manorialism? a structure that defined a peasant’s relationship to the lord of the manor
a system of rights and obligations between lords and vassals
the process of city-state building in Italy
a system of land ownership in Song China

im pretty sure it has something to do with the end of ww1

b. andrew

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.

i believe the answer is d.