A week is the time needed for?

Question

A. the sun to drift completely around the sky

B. the moon to drift completely around the sky

C. the earth to turn completely on its axis

D. None of the above

Answer 1

D, none of the above.

Most units of time which we use are based an astronomical cycles, like a year, and a month (loosely).  The week is more of a religious "artifact".  The only astronomical connection I can think of it that the seven days are named for the seven astronical bodies which were known since antiquity.  In latin I think, for instance "Sunday" is pretty obvious, Monday = moonday, see link

Answer 2

d

it is, however, approximately the interval between moon phases.

Answer 3

"D"

Answer 4

D.  A week is a useful subdivision of time, which has had varying lengths, but it has no astronomy connection.

Answer 5

D