If a right circular cone is separated in...

If a right circular cone is separated into solids of volumes `V_1, V_2, V_3` by two planes parallel to the base, which also trisect the altitude, then `V_1 : V_2 : V_3` is____

A

1 : 2 : 3

B

1 : 4 : 6

C

1 : 6 : 9

D

1 : 7 : 9

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