I think that it was the serpents fault that Eve ate from the tree. She was not tempted to eat from it because she had many other trees and plants to eat from, but when the serpent told her that she would gain more knowledge and advised her that she wouldn't die, she was more attracted. In the story, the serpent says "For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil." This sentence shows how the serpent was trying to tempt Eve and show her how good eating from the tree could be. The serpent also said "You will not surely die." This made Eve feel more secure about eating from the tree. If the serpent didn't influence and persuade her to eat from the tree, I don't think she would have.
