Was rock and roll a form of contiguous or non contiguous movement?

It is actually a form of contagious diffusion. I know because i did a paper on the history of rock and roll for APHG and we went over the answers in class and she agreed that it was contagious diffusion. It was widespread and it spread rapidly. 

Iknow what you are working on the correct answer is c

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: