Recently, a health organization estimated that the flu vaccine was 75​% effective against the influenza B virus. An immunologist suspects that the current flu vaccine is less effective against this virus. Pick the correct pair of hypotheses the immunologist could use to test this claim.       Question content area bottom Part 1 Choose the correct answer below.     A. H0​: p>0.75 Ha​: p<0.75   B. H0​: p=0.75 Ha​: p>0.75   C. H0​: p=0.75 Ha​: p<0.75   D. H0​: p=0.75 Ha​: p≠

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