Primary sources are the records written by the the scientists regarding their own experiments.
Answer: Option A
Step-by-step explanation:
Primary sources are the direct or first-hand snippets written by the scientists on their own based on their experiments that would help in providing additional evidence to the research. Using primary source help in thinking critically and analytically with respect to the research.
It helps in exploring with several perspectives that would result in figuring out additional data. Primary data supports in coping with the contradictions. It acts as an evidence for the data since it is the direct resource related to the experiment.