Pat Claims to Save a Great Deal of Money on Groceries

Pat claims to save a great deal of money on groceries by traveling to various supermarkets to make her purchases at their advertised sale prices. She might visit as many as five different stores in one day in order to complete her weekly shopping. Her savings are not as great as she may think they are if she does not consider the:

A) value of the time she is spending doing the shopping as opposed to other things.
B) cost of the gasoline in driving from one store to another.
C) mileage she is putting on her car driving from one store to another.
D) all of the above