Answer:C. The visitor left his stick behind.
Explanation:
Your question is referring to the excerpt from ''The Hound of the Baskervilles'' by Sir Arthur Conan Doyle in which Sherlock is describing his visitor at the beginning of the first chapter.
''Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he stayed up all night, was seated at the breakfast table. I stood upon the hearth-rug and picked up the stick which our visitor had left behind him the night before.''
After that, Sherlock picks up the stick and read what is written on it and then he is asking Watson about his opinion on it.
He was considered as the absent-minded because he left something with his name and evidence that is showing that he was there. If he was aware, he would not do that. In that way, Sherlock got all information about him.
There are many eruptions that have happened and has affected the population extremely. La Soufriere volcano eruption that took place in 1902-2021 has affected many people that lived nearby. Many houses were destroyed and over 1600 lives were taken during the 1902 eruption. With modern science Volcano eruptions can be predictable and this has been very useful to notify people that they may be in danger in case of a volcano eruption but unfortunately not all volcano eruptions are always predictable because It is very difficult to gather enough data to find clear patterns in this wide range of volcanic behaviors. My predictions for unpredictable eruptions is that there would have been more people that died and this can also affect the earth's climate and weather because the gases and dust particles thrown into the atmosphere during volcanic eruptions can influence the Earth's climate.