As temperatures rise, the chances of lightning strikes and fires in tropical rainforests also increase. However, current monitoring indicates that although rain lightning strikes in the American rainforest are more frequent, they do not cause more forest fires. Researchers believe this may be related to the large increase in vine plants in the rainforest in recent years. Which of the following, if true, would best support the above conclusion? ['Lightning and lightning strikes often cause temperate forest fires, but tropical rain forests do not cause large fires due to high humidity.', 'The coverage of vines in the tropical rain forest in 1968 was 32%, and the current coverage rate is as high as 60%, and some areas even exceed 75%.', 'The stem of the vine has less resistance to the branches, and can conduct lightning like a lightning rod on a building, allowing most of the current to be conducted from its own stem.', 'A lightning strike of such a large scale and extremely fast speed first destroys the external vine plants, and the trees in the middle are protected.']