Molds were once used only for small amounts of fat, shared with neighbors at cooperative candle clippings or supplied by______candle makers who canvassed large geographical areas.（）

A、 Migration is in most cases dictated by life course events as opposed to the economic factors that contribute to the development of cities.
B、 Population growth tends not to affect the availability of proxies for replacing emigrants from population centers.
C、 Sedimentary populations are more historically significant than nomadic or migratory ones.
D、 It is permissible to rely upon a single source of information in studying population movement patterns.
E、 Migration can be disregarded as a demographic pattern in historical contexts prior to the development of large cities.

A、 Migration between towns stands in direct contrast with the accumulation of population in cities.
B、 Parish populations would grow at fairly equal rates, given the fact that those who left a parish in response to life course events were usually replaced.
C、 Migration between parishes was a rare enough phenomenon that it was unnecessary to keep records of it in any fashion.
D、 Parish populations often chose to remain sedimentary as a result of the homogeneity of the various countryside parishes.
E、 Parish populations owed their existence on the whole to the influx of populations due to life course events.