Which of these is the best evidence that the influenza virus continues to evolve? A) The flu can spread worldwide in a season. B) The flu has multiple symptoms, impacting respiratory, digestive, and muscular

Which of these is the best evidence that the influenza virus continues to evolve?

A)
The flu can spread worldwide in a season.
B)
The flu has multiple symptoms, impacting respiratory, digestive, and
muscular systems in humans.
Flu vaccines must be administered annually to reduce the likelihood of flu
infection during flu season.
D)
The flu continues to have high rates of mortality in the most elder and
youngest subset of the human population.

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