What Is the Main Function of Cellular Tight Junctions

What is the main function of cellular tight junctions?

A) They resist forces that tend to pull cells apart.
B) They form barriers that restrict the passage of materials through the extracellular space between cells.
C) They are protein channels that allow the movement of ions between the cytosol of adjacent cells.
D) They are spaces that allow movement of substances between the interior of the nucleus and the cytosol.
E) They hold the genetic material in a tightly coiled conformation.