A.I. Explanation:

Option 1: "Treehouses are not usually built for permanent dwellers."

Explanation: The text indicates that tree houses are constructed for leisure or as a retreat, which implies they are not intended for permanent living. This aligns with the main idea that tree houses serve temporary purposes rather than being permanent residences.

Option 2: "Treehouses are popular all over the world, especially in coastal areas."

Explanation: The text does not mention the popularity of tree houses in coastal areas or globally. Therefore, this statement lacks supporting information and is not substantiated by the text.

Option 3: "Treehouses are not taxed by the government, as long as trees are not damaged beyond a certain point."

Explanation: There is no information in the text regarding taxation of tree houses or conditions under which they might be taxed. This makes the statement unsupported and irrelevant to the content provided.

Option 4: "The placing of structures on mature and well-developed trees is no child's play; it requires a lot of planning, in order to cause the least damage to trees."

Explanation: The text emphasizes the need for careful planning to minimize damage to trees when constructing tree houses. This is supported by the mention of various techniques and methods that ensure the least impact on the tree, confirming the correctness of this statement.

Option 5: "Treehouses are a major attraction for toddlers and children since they do not pose any kind of danger."

Explanation: The text does not address the safety of tree houses for toddlers or children, nor does it suggest that they are a major attraction for this age group. Thus, this statement is not supported by the text.