The phrase helps to conclude the text and does not add to the writing. ... The phrase adds a specific detail about time that is relevant to the text's topic. The phrase helps to introduce the text's topic by providing a direct object.
C. to introduce Robin Hood as a famous outlaw, or criminal, who lived in Sherwood Forest.
I believe the answer would be D: a current study on the effects of stress on the body published by a medical journal.
Hope this helps.
Complex and compound sentences.