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Two rods of different materials having c...

Two rods of different materials having coefficient of thermal expansion `alpha_1` and `alpha_2` and Young's modulus `Y_1` and `Y_2` respectively are fixed between two rigid supports separately. The rods are heated such that they undergo same temperature increment. If thermal stress developed in two rods are equal, then `Y_1 : Y_2` is

A

`(alpha_1)/(alpha_2)`

B

`(alpha_2)/(alpha_1)`

C

`1:1`

D

`(alpha_1+ alpha_2)/(alpha_1-alpha_2)`

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