Using Similar Techniques That Were Originally Developed to Process Miniaturized $\mu$

Using similar techniques that were originally developed to process miniaturized semiconductor electronics,scientists and engineers are creating Micro-Electro-Mechanical Systems (MEMS) .Consider a silicon post that is part of a MEMS device that is being heated by an electric current flowing through the post.The coefficient of thermal expansion for silicon is 3.2 * 10^-6 K^-1.The post is 1950 $\mu$ m tall and 45 $\mu$ m in diameter at room temperature.At any given time,you may assume that the temperature is constant along the entire length of the post,which strictly speaking is not the case.As the post heats up from room temperature to 492^oC,its height will be

A) 1950 $\mu$ m.
B) 1953 $\mu$ m.
C) 1947 $\mu$ m.
D) 1956 $\mu$ m.
E) 1944 $\mu$ m.

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