Which of the following statements about the cells of living organisms is/are correct?
A. All are microscopic and cannot be seen with a naked eye.
B. All have a cell wall.
C. All have a nuclear membrane.
D. All have a cell membrane.
Choose the correct option:

Correct option is D

The correct option is (d) Only D.
Statement A is incorrect. While many cells are microscopic, there are some that are large enough to be seen with the naked eye. For example, ostrich eggs are single cells.
Statement B is incorrect. Not all cells have a cell wall. Plant cells have cell walls, but animal cells do not.
Statement C is incorrect. Not all cells have a nuclear membrane. Prokaryotic cells do not have a nuclear membrane.
Statement D is correct. All cells have a cell membrane. The cell membrane is a semipermeable barrier that surrounds all cells and regulates what enters and exits the cell.