Question

janet is writing a research paper about the use of radiation in cancer treatment. she has located a source she wants to use: an article published in a peer-reviewed journal focused on cancer research, written by david sparks, m.d. in 1976. why might this source not be credible?
a. its findings have not been verified.
b. it was not written by a researcher.
c. it is not likely to be unbiased.
d. its information may be out of date.

Explanation:

Since the article was written in 1976, medical knowledge (especially in cancer treatment) has advanced significantly. Information from 1976 is likely outdated compared to current research.

Answer:

D. Its information may be out of date.