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Vaccines for certain viral infections, such as those for smallpox and measles, may remain effective for many years. However, vaccines for other viral infections, such as those for influenza, are usually effective for one season . Which statement best explains why influenza vaccines are effective for a short period of time?

A) The influenza virus is much stronger than other viruses, rendering the vaccine ineffective over time .
B) The influenza virus mutates faster than other viruses, leading to new viral strains not present in the vaccine .
C)The vaccines for influenza are weaker than other vaccines, causing antibodies to ignore an immune response.
D) The vaccines for influenza have an expiration date, causing them to be ineffective after a short time