The coefficient of linear expansion 'a' of a rod of length 2 m varies with the distance x from the end of the rod as a=a₂ + ax where a, = 1.76 x 10°C and a, = 1.2 x 10 m C. The increase in the length of the rod, when heated through 100°C is ______.
A) 2 cm
B) 3.76 mm
C) 1.2 mm
D) None of these​