Which of the following is a divergent boundary? a. transform b. oceanic-continental c. rift valley d. continental-continental?

The correct answer is C. Rift Valley.
Rift valleys are formed when two continental tectonic plates are moving away from each other. With their movement on opposite directions a rift appears, and as time passes and the plates get further away from each other the rift becomes wider and wider, thus creating a rift valley.

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: