how did otto i gain support from many church bishops?\nby choosing a pope who supported him\nby conquering…

Brief Explanations:

Otto I used the power of lay - investiture. Lay - investiture gave him the ability to appoint church officials, which in turn gained him support from many Church bishops as he could influence who held important ecclesiastical positions. Conquering land didn't directly gain him bishop support, choosing a Pope wasn't a common practice for him to gain bishop support, and simony is the act of selling church offices which is not how he gained support.

Answer:

by using the power of lay investiture