Three bars having length l, 2l and 3l an...

Three bars having length `l, 2l and 3l` and of cross-section `A`, `2A` and `3A` are joined rigidly end to end Compound rod is subjected to a stretching force `F` . The increase in length of rod is (Young's modules of material is `Y`, and bars are massless)
(A) `(13Fl)/(2AY)`
(B) `(Fl)/(AY)`
(C) `(9Fl)/(AY)`
(D) `(3Fl)/(AY)`

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