A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is $$k'$$. Then they are connected in parallel and force constant is $$k"$$. Then $$k' : k"$$ is

A

1 : 11

B

1 : 14

C

1 : 6

D

1 : 9