A nuclear explosion generates so much heat that it turns steel structures in the immediate area into steel vapor. What is the correct name of the type of phase transition that is represented by this process?
a) This process is an example of freezing.
b) This process is an example of melting.
c) This process is an example of sublimation.
d) This process is an example of vaporization.
e) This process is an example of condensation.