For your question, the answer is D
The conflict between Henry IV and Gregory VII Concerned the question of who got to appoint local church officials. Henry believe that, asking, he has the right to a point the bishop of the German church. This was known as lag investiture.
Hope that helped
C.) trial by jury of peers
Once the river floods it can destroy houses that are near it or even crops, however, when the nile river floods it also helps water the soil near the river that will aide in planting crops