Both Trees

It may be that both trees are in the midst of the garden. If only one tree is in the midst of the garden, it would be the Tree of Life. The other tree is mentioned along with it. However, Eve said that they weren't to eat from THE tree in the midst of the garden, as if there was only one.

We will get to the idea of both trees being in the midst of the garden. To get there, consider choosing that Eve must have been referring to the Tree of Life being in the midst of the garden.