Answer:
A) Repetition
Step-by-step explanation:
If you complete several attempts on your experiment, this is called repetition.
The repetition serves to safely answer the experimental data that will be used its average values and is used with the objective of trying to avoid the effect of the environment in the studied variables as much as possible.
It is quite common to choose 3 repetitions, as a good number to start. This is because the number 3 avoids the invariability of the number 1, escapes the danger of coincident repetition represented by the number 2, and already presents some variation, which in most cases is already sufficient to test the variability determined by the variation factors and by the repetitions.