What is the term for the vast underground networks in which early Christians buried their dead?

The two centuries of peace that began under the reign of Augustus is generally called the_____

A) ?tetrarchy B) soldier emperors? C) Pax Romana? D) senate

What characterizes the new sound of black music in the 1970s?

a) a wider exploration of world music b) lyrics about folk heroes c) sixteen-beat rhythmic foundation d) more subtle timekeeping