How do you say in Spanish
the chalk
the chalkboard
the class
the classroom

The chalk is la tiza

The chalkboard is la pizarra

The class is la clase

The classroom is el aula or la sala de clase depending on which dialect

La tiza
la pizarra
la clase
la aula

Fission reactions can get out of control without neutron moderation. The correct option among all the options that are given in the question is the fourth option or option "D". The other options in this question can be discarded. I hope that this is the answer that you were looking for and it has come to your help.