Some information about bacteria and viruses is arranged in this table. Which argument about bacteria and viruses is supported by this information?

A. Bacteria are larger than viruses but are still small enough to enter cells.

B. Both bacteria and viruses are surrounded by protective coverings, through the composition of each covering may be different.

C. Only bacteria can acquire new characteristics, which makes them more difficult to treat.

D. Bacterial infections such as diphtheria and tetanus cannot be prevented by vaccines.