An Aluminum Rod of Length 20 $\circ$ C,find the Stress in the Rod When the Temperature Rises

An aluminum rod of length 20.000 m and cross-sectional area of 7.00 * 10^-4 m² is placed securely against two immobile end points.The rod is initially placed when the temperature is 0 ^$\circ$ C,find the stress in the rod when the temperature rises to 40 ^$\circ$ C.( , )

A) 43,100 N
B) 86,200 N
C) 6.16 * 10⁷ Pa
D) 1.23 * 10⁸ Pa
E) 1.76 * 10⁸ Pa