The strategy used by the public health in reducing influence of flu is letter d, hygiene education. It is because with hygiene education as a strategy in the given scenario above helps in reducing flu for teaching the proper ways in preventing certain factors that could lead to this sickness could help reduce percentage or incidence of flu. This also promotes proper hygiene where it teaches cleanliness to the body, that could fight against harmful or dirty substances.
I say, that if someone chooses the life of an influencer they need to live up to that. This does not however mean that they aren't allowed to have private lives. They do need to maintain their reputation though, since they have a large group of people looking up to them.
Hope this helps!