A Small Centrifuge Head Has 12 Spots (Holes) Labeled in a Manner

Multiple Choice

A small centrifuge head has 12 spots (holes) labeled in a manner similar to a clock face. There are three tubes of equal volume that need to be centrifuged. In which of the following choices for tube placement would the centrifuge be balanced?

A) 1, 2, 3
B) 1, 4, 7
C) 1, 5, 9
D) 1, 3, 8