In bicyclo[3.2.1]octane, the bridgehead carbons and the one-carbon bridge are numbered respectively

AC-1 and C-5; C-8
BC-1 and C-6; C-7
CC-1 and C-4; C-8
DC-2 and C-5; C-8

Answer: A

Numbering starts at a bridgehead (C-1), runs along the longest (3-carbon) bridge C-2 to C-4, reaches the other bridgehead C-5, continues along the 2-carbon bridge (C-6, C-7), and finally the shortest bridge, here the single carbon C-8.

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