It is difficult to keep deep wounds free of bacteria. Even strong antibiotics fail to kill the bacteria that live in such wounds. However, many physicians have succeeded in eliminating bacteria from deep wounds by packing the wound with a sweet substance like sugar. Which one of the following, if true, most helps to explain why treating deep wounds with sugar as described above is successful? ['Sugar that is nearly pure is readily available for use in medical treatments.', 'Many kinds of bacteria can use sugar as a nutrient and will reproduce rapidly when sugar is available to them.', 'Bacteria that live in deep wounds thrive in a moist environment, and sugar has a dehydrating effect.', 'Some foods that contain sugar can weaken the effects of certain antibiotics.']