A metal rod has a length of 100cm at 200${}^{o}C$. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 x 10${}^{-5}{C}^{-1}$

A. 200${}^o$C
B. 300${}^o$C
C. 100${}^o$C
D. -100${}^o$C  

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Correct Answer: D