In 1883, citizens all over America reset their clocks and watches to reflect the current time in one of four new U. S. time zones. These new time zones were the result of .
a.
the United States’ cooperation in a world-wide time zone reform
b.
American railroad companies trying to simplify and coordinate their schedules
c.
labor unions arguing the need for factory workers to work the same work day from 8 a. m. to 5 p. m.
d.
Samuel Morse’s realization that the sun will rise on the West coast three hours earlier than the East coast

Please select the best answer from the choices provided

A