Modern Railway Tracks Consist of Continuous Welded-Steel Rails of 1 $\times$

Multiple Choice

Modern railway tracks consist of continuous welded-steel rails of 1.0-km lengths.If the coefficient of linear expansion of steel is 11 $\times$ 10^-6 K^-1,by how much would such a rail change in length between the highest summer temperature (40ºC) and the lowest winter temperature (-40ºC) ?

A) 44 cm
B) 88 cm
C) 0.88 mm
D) 1.8 mm
E) 4.4 cm