The image sent shows a cell with a rigid wall around it and small balls inside and outside of the cell. This image best represents a non-permeable cell wall. So, the correct option is C.
A non-permeable cell wall is a rigid layer that surrounds plant cells and some types of bacteria. It is made of cellulose, which is a strong and flexible polymer. The cell wall helps to protect the cell from damage and maintains its shape.
The other options are not as well-represented by the image:
Permeable exoskeleton: An exoskeleton is a hard outer covering that protects some animals, such as insects and crabs. It is permeable, which means that it allows materials to pass through it.
Waterproof nuclear envelope: The nuclear envelope is a double membrane that surrounds the nucleus of the cell. It is waterproof, which means that it protects the DNA inside the nucleus from damage.
Selectively permeable membrane: The selectively permeable membrane is a thin layer that surrounds all cells. It allows some substances to pass through it, but not others. This allows cells to regulate what enters and leaves them.
Therefore, the answer is C. a non-permeable cell wall.