The cell membrane of a cell is said to be semi-permeable because

A. it allows only large molecular substances to pass through it into the cell
B. it is actively involved in energy production in the cell
C. it actively allows all substances to pass through it by diffusion
D. it is actively selective in allowing substances to pass through it
E. fatty acids are only the building blocks of the membrane

Correct Answer: Option D

it is actively selective in allowing substances to pass through it