A glass thermometer using a thin column of ethyl alcohol at room temperature (293.0 K) is cooled. When the temperature reaches 273.0 K the column of alcohol is 15.50 cm high. How tall was it when the temperature was 293.0 K? The coefficient of volume expansion of mercury is 
A. 15.85 cm
B. 15.86 cm
C. Cannot answer without knowing the diameter of the column
D. 15.62 cm
B. 15.86 cm
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