A Particularly Gullible Consumer Decides to Waste His Money and Buy

A particularly gullible consumer decides to waste his money and buy one of the ubiquitous hand cleaning products that claims to kill 99.9% of germs. Soon after using the product, the poorly informed consumer found that his hands were again teeming with bacteria. This could be because

A) bacteria spontaneously generated on his hands.
B) the product does not kill bacteria.
C) the bacteria have developed resistance to the product.
D) some bacteria have an impermeable intracellular layer that prevents the entry of all substances.
E) some bacteria produce endospores that are resistant to soaps and disinfectants.