Each Similar Audience Has Its Seed List Members Removed To Ensure What?

Q: Each Similar Audience Has Its Seed List Members Removed To Ensure What?

A) That no user overlaps between a similar list and its seed list
B) That ads are shown in competitive positions
C) That ads do not risk double-serving
D) That only highly-relevant traffic is targeted

Correct Answer is A) That no user overlaps between a similar list and its seed list