It's A.: Performer and action.
An artist and a construction worker are performers of their job. Painting is an action an artist does, and hammering is an action a construction worker does. :D
Answer:
April 18, 1955
Explanation:
Because, "Death. Einstein died on April 18, 1955, at age 76 at the University Medical Center at Princeton. The previous day, while working on a speech to honor Israel's seventh anniversary, Einstein suffered an abdominal aortic aneurysm".
Non-print source, as it isn't something that has been published by physically printing it
D. Poverty isolated African Americans from the mainstream of American society