C.) An article from a scholarly journal entitled "The impacts of testing on students ages 6-9" published in 2019
Explanation:
The reason that this is the correct answer is that the article is from a reliable source and it was written recently ensuring that you get updated information, as well as it is going through the exact information that you need for your research paper. If you were to choose A then it wouldn't really add anything to your research paper and it would just talk about a random teacher teaching experience, this source is neither enhancing nor reliable. If you were to choose B then it would be too outdated to be useful and or informative making the text not reliable and potentially giving you incorrect information. Next, if you were to choose D then it wouldn't be reliable since it isn't from a trustable source (Wikipedia) neither is it talking about information that is necessary for making your text more engaging
