Although each of the subjects knew they could quit at any time, none of them asked to stop the experiment. they all continued to the bitter end. –jimmy olsen, page 251

now read the following passages from a separate article. which of the following uses of the above passage is not considered plagiarism?
a. each of the subjects knew they could quit, but none of them asked to stop the experiment. in fact, they all continued to the bitter end, even though they were very anxious (olsen 251).
b. even olsen seemed surprised by the findings. he remarked that “although each of the subjects knew they could quit at any all continued to the bitter end” (olsen 251).
c. although the subjects knew they could quit, none of them even asked to stop the experiment!
d. and as we look at these subjects, although clearly anxious, none of them asked to stop the experiment. they all continued to the bitter end (olsen 251).