Answer:
The correct option is replication.
Step-by-step explanation:
In the English language, replication simply means to practice something which has already been done or to copy something.
In an experimental class, the demonstrator has to perform an experiment before the students so that the students get a better understanding about what needs to be done. Also, the demonstrator should guide the students with the precautions which need to be taken for that experiment.
The students then copy the experiments as were shown by the demonstrator. In this way, they can perform the experiment in a better way with not many errors. This shows an act of replication.