Answer: Option D
Explanation:
Plasma membrane can be defined as the outer most part of the cell that performs many vital functions for the cell.
It aids in providing structural support to the cell. It prevents the entry of undesirable substances.
Plasma membrane is selectively permeable and it allows the movement of only some particles and molecules which is essential for the cell. It is non permeable as it does not allows the movement of each and every substance.
Hence, the correct answer is option D
