Answer:
a. it is used to turn water into steam.
Step-by-step explanation:
In fission reaction the reaction is carried out in the reactor which is surrounded by water.
When energy is released in fission reaction it is absorbed by the water which is surrounding the reactor and then that water is converted into steam using this energy of fission
Further this steam is used to operate turbine which will convert the energy of team into electrical energy.
So in this way first of all the in this fission reaction energy is used to convert water into steam