Let me describe the three types of cells you listed and then you can decide which matches the description.
Palisade cells are located right below the epidermis of the leaf. They are elongated, tightly packed cells and are the primary site of photosynthesis.
Guard cells are curved cells that come in pairs. They surround the stoma of the leaf.
Spongy mesophyll are irregularly shaped cells that loosely fill the center of the leaf.
I have attached a picture to help you see the three types of cells. I hope that my answer helps you out!
