Question

compare the student text with the source.
source: alexandra sifferlin, \the case against antibacterial soap is getting stronger.\
published in time, 2016:
now a new study done in zebrafish suggests triclosan also messes with our gut—interfering with the community of bacteria that makes up our microbiome.
student text:
according to sifferlin, triclosan messes with our gut—interfering with the community of bacteria that makes up our microbiome.
is the student text plagiarized?
no, it is not plagiarized.
yes, because it fails to use quotation marks.
yes, because it fails to cite the source.

Explanation:

The student text attributes the information to Sifferlin (citing the source) and paraphrases the content (not using direct quotes without marks, but paraphrasing is allowed with proper citation). The first option is correct as it's a proper paraphrase with attribution, so it's not plagiarized. The other options are incorrect: the student did cite the source (via "According to Sifferlin") and not using quotation marks is fine for paraphrased content (quotation marks are for direct quotes).

Answer:

No, it is not plagiarized.