A sentence from a source reads:
Children have been seen behaving in a hyperactive manner after consuming large quantities of candy, but there is no scientific data to explain the biological mechanism behind this change in behavior.
The student writes in his essay:
When we think of candy, we often associate that with childhood. We tend to see candy as the ultimate childhood treat, something that a child can earn for being good. Observation can tell us that some children can become hyperactive after they consume large amounts of candy, thusly making them act out, no longer being good. While there has been no scientific data to explain the biological mechanism behind this change in behavior, it does stand to reason that limiting a child's intake of candy is a good move (Hartlane, 2004, p. 26).
Is this plagiarism? Why or why not?