A firefly show is held in a scenic spot, which attracts a large number of visitors every day. After a few days, the number of fireflies in the scenic area has dropped sharply. The person in charge of the scenic spot believes that the uncivilized behavior of tourists has damaged the living environment of fireflies. Which of the following, if true, can support the viewpoint of the person in charge of the scenic spot:. ['Fireflies have high requirements for the ecological environment.', 'The uncivilized behavior of B tourists also exists in other scenic spots.', 'The number of fireflies extinction has dropped sharply after regulating tourist behavior.', "The number of insects of the same type as D and fireflies is not greatly affected by tourists' behavior."]