What actions should be taken prior to converting the relationship?

An administrator would like to convert a Master-Detail relationship to a Lookup relationship.

What actions should be taken prior to converting the relationship?
A . Remove child object related lists from the parent object page layouts.
B . Delete all roll-up summaries that reference the detail object prior to converting,
C . Select the Allow Reparenting option on the master-detail relationship.
D . Delete all reports that use the master object with the detail object report type.

Answer: B