It's either A or D.

Barbara needs to bring in a check to hold her spot on the class field trip to Washington D.C. Barbara's mother does not get paid until the end of the month but told Barbara she can write a check and date it for the 31st. Which of the following checks did Barbara's mom write to hold her spot on the field trip?

A: Predated check
B: certified check
C: stale check
D: Postdated check.