On a Ford assembly line, each worker A) moved from station to station.
B) was responsible for several different tasks.
C) performed the same task over and over. CORRRECT
D) built at least one car each day.

Do you mean israel ?

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.