The diameter of rod A has twice the diameter of rod B, but both are made of iron and have the same initial length. Both rods are subjected to the same decrease in temperature and contract. How would the change in the rods' length compare?
a. The length of rod A contracts more than the length of rod B.
b. The length of rod B contracts more than the length of rod A.
c. Rods A and B contract by the same amount.