Is the student text plagiarized?

 - Yes, because it fails to use quotation marks.
 - No, it is not plagiarized.
 - Yes, because it fails to cite the source.
 - Yes, because it fails to use quotation marks and fails to cite the source.
The student text is plagiarized. Although it uses quotation marks around the source's exact words, it fails to cite the source.
Ruts from wagon wheels are still visible in the Oregon Trail today, which is not surprising given that "between 1841 and 1866 about 350,000 people used what had become the most famous wagon route across America."
Source: Bob Brooke, "Oregon Trail: Wagon Tracks West." Published in Wild West Apr. 2000.
Between 1841 and 1866 about 350,000 people used what had become the most famous wagon route across America. It is no wonder that, in places, ruts along the Oregon Trail are still visible today.