If Shaniqua Wants to Be Sure Her Bathroom Scale Has

If Shaniqua wants to be sure her bathroom scale has test-retest reliability she should

A) weigh herself today and then eat a lot; get on the scale again and see if her weight changes
B) get on-and-off the scale repeatedly and see if it shows the same weight each time.
C) ask others to weight themselves later that day.
D) buy a second scale and see if they both give her the same weight when she steps on them.