The main difference between plant and animal cells is
 

• Eukaryotic cells, such as those found in plants and animals, share a number of traits, including the presence of cell organelles, nuclei, mitochondria, and endoplasmic reticulum as well as cell membranes.
• Cell walls are absent from animal cells. There is merely a cell membrane on them.
• Plant cells have a cell wall as an additional layer above the plasma membrane. It provides shape, safety, and strength, making it an essential component of the plant cell. Cellulose makes up the plant's cell wall.
• Cell walls are absent from animal cells. They possess a cell membrane, a crucial barrier that keeps the interior of the cell isolated from the outside environment and regulates the flow of molecules into and out of the cell.
• Cell membranes exist in plant cells. In plants, the cell wall and cytoplasm are separated by the cell membrane.

Hence, option A is the correct answer.