What does "it" refer to, in: “Satan caused them to slip from it”?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It refers to the Garden (i.e. they were removed from "it").
2. It refers to obedience (ṭāʿah). (i.e. Satan caused them to slip from their state of obedience.)
3. It refers to the tree (al-shajarah), i.e. Satan caused them to slip by means of the tree.