If the Ratios of Prices and the Ratios of Marginal

If the ratios of prices and the ratios of marginal utilities are not equal,then Mary,with a tight and limited budget for food,can increase her welfare by

A) not spending on food at all.
B) changing the price of food.
C) waiting for the prices to fall before spending on any food.
D) reducing the consumption of foods that yield relatively low amounts of marginal utility per dollar.
E) increasing consumption of all food.