The radius of base of solid cone is 9 cm and its height is 2

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SSC CGL Tier-2 20-February-2018 Maths
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The radius of base of solid cone is 9 cm and its height is 21 cm. It cut into 3 parts by two cuts, which are parallel to its base. The cuts are at height of 7 cm and 14 cm from the base respectively. What is the ratio of curved surface areas of top, middle and bottom parts respectively?

[SSC CGL Tier-2 20-February-2018 Maths]

A 1 : 4 : 8

B 1 : 3 : 5

C 1 : 3 : 9

D 1 : 6 :12