Answer :
The answer is C because it is the only one that would allow you to conduct a proper/credible experiment.
Answer:
The correct answer will be option-C
Explanation:
A scientific experiment is performed to test the predicted hypothesis which is based on the previous research.
In the given question, the researcher has performed the test on pig farms in the past related to the supplement which could have provided the related data to form a hypothesis.
To test how the supplements affect the pig's development, the previous knowledge will be used to form a hypothesis and to organize the samples in the experiment which will reduce the time as well as will increase the efficiency of the experiment.
Thus, Option-C is the correct answer.