When People Have to Shift from One Work Schedule to Another,which

When people have to shift from one work schedule to another,which of the following helps them adjust to the shift most easily?​

A) Shift to a schedule that starts work a few hours earlier in the day.
B) ​Shift to a schedule that starts work a few hours later in the day.
C) ​Shift the schedule frequently, at least once a week.
D) ​Keep the lights dim for people working the late night shift.