Respuesta :
The correct answer is C. Secondary sources lack medical expertise.
Explanation:
The excerpt presented focuses on providing recommendations to determine whether a source is reliable or not, especially when dealing with sources related to health. In this text, the author specifies that it is necessary to evaluate the data of sources "try to determine whether the information is supported by evidence from scientific studies, other data, or expert opinion".
Also, the author refers to secondary sources such as internet sites and about this it clarifies these are based on interpretations "relying on another person's interpretation" and might lack of expertise in the area "it lacks the expertise of a medical journal or a national organization specializing in that field of cancer", which suggest secondary lack credibility and should not be used. According to this, the statement that summarizes the passage, especially about secondary sources is "Secondary sources lack medical expertise".