An iron-carbon alloy initially containing 0.291 wt%C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1180°C. Under these circumstances, the carbon diffuses from the alloy. Determine the final carbon content of the alloy after diffusion.
a) 0.291 wt%C
b) Less than 0.291 wt%C
c) More than 0.291 wt%C
d) Not enough information to determine