[单选题]
The heat required to change a substanrgv6sg4 jv83 x0 5gfs0l;nhbnce from th)a3j7z2::tj qncwqdup*09b krw * ci re liquid to the vapor state is refewj wjq3c:z*pqt 2b) 7nk0ur:* 9dicarrred to as the
A. heat of fusion.
B. heat of vaporization.
C. heat of evaporation.
D. heat of condensation.
