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A cylinder of radius R is surrounded by a cylindrical shell of inner radius R and oputer radius 2R. The thermal conductivity of the material of the inner cylinder is `k_(1)` and that of the outer cylinder is `K_(2)` ,Assumming no loss of heat , the effective thermal conductivity of the system for heat flowing along the length of the cylinder is :

A

`(K_(1)+K_(2))/(2)`

B

`K_(1)+K_(2)`

C

`(2K_(1)+3K_(2))/(5)`

D

`(K_(1)+3K_(2))/(4)`

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