Which of the Following Explains Why Navigators Prior to a Few

Multiple Choice

Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?

A) Determining longitude requires mathematical techniques that were not known at the time.
B) Determining longitude requires much more precise measurements of angles in the sky than does latitude.
C) Determining longitude requires accurate tables of the celestial coordinates of stars,while determining latitude does not.
D) Determining longitude requires an accurate clock,but latitude does not.