Answer: A. Acorns
Explanation: Typically when you look at the food web and really put your mind to it, you notice that "Acorns" is being eaten by squirrel, mouse and deer. While the other options just have two organisms feeding on them.
Why i pick Acorn is because its also an organism. When you said organism, you are both referring to animals, plants, diseases, viruses etc. The deer is only having 2 natural enemies.
