Answer:
Wednesday
Step-by-step explanation:
It is Wednesday. If it was any other day of the week, more than one statement would be true. To solve the riddle, evaluate each person’s statement and write down what day it could be according to the statement. David’s statement indicates it could be any day of the week except for Wednesday. When you list the days that it could be according to everyone’s statement, it turns out Wednesday is the day mentioned only one time.