to include additional variables in the experiment to complete the steps of the experiment in less time to find a less expensive way to conduct the experiment to increase the likelihood of accurate experiment results
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Why do scientists perform multiple trials of the same experiment?
Possibilities:
- to include additional variables in the experiment
- to complete the steps of the experiment in less time
- to find a less expensive way to conduct the experiment
- to increase the likelihood of accurate experiment results

to increase the likelihood of accurate experiment results