In Hypoxic Injury,why Does Sodium to Enter the Cell and Cause

In hypoxic injury,why does sodium to enter the cell and cause swelling?

A) Because the cell membrane permeability increases for sodium during periods of hypoxia
B) Because there is insufficient ATP to maintain the pump that keeps sodium out of the cell
C) Because the lactic acid produced by the hypoxia binds with sodium within the cell
D) Because sodium cannot be transported in the cytosol to the cell membrane during hypoxia