Sarah Stopped at the Supermarket to Quickly Pick Up Some

Sarah stopped at the supermarket to quickly pick up some milk, bread, cat litter, and a tomato. When she saw the total come up on the screen, she swore that it was a dollar higher than it should be. But no, the prices were all correct on her receipt. It was just that they had all gone up. So had the cost of clothing, cars, and most everything else. This is called

A) the gold standard.
B) inflation.
C) increased purchasing power of the dollar.
D) stored value.