I think following celebrities on their holidays is an invasion of privacy.
Invasion means entering into someone else private space.
Because its good to love your favorite celebrity and wanting to have conversations and pictures with them. But everyone deserves to have some privacy time with themself and with their family. So, the celebrities too have the right to enjoy their time with their families on a holidays, as you go to met them you act like crazy fan which causes a invasion for them as well as their family member and their holiday get spoil. So, its always important to first consider the scenario before meeting your favorite celebrities, just check that are you unintentional causing invasion.
Hence the correct option is, D. invasion
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