David washes his hands excessively, even when he has not touched anything that belongs to another person or because his hands are dirty. Ellen is consistently anxious about whether all burners on the stove are turned off before she goes to bed, whenever she is ready to leave the house, and when she first wakes up in the morning. David's behavior BEST illustrates a(n) _____ and Ellen's behavior BEST illustrates a(n) _____.
