The correct answer is C. Both the outer and inner membrane.
The phospholipids bilayer of the mitochondria is both the inner and outer membranes.
Phospholipids are termed as class of lipids which are the important component of a cell membranes.
Phospholipids can form lipid bilayers reason being their amphiphilic characteristics. Phospholipids' structure consists of two hydrophobic fatty acids which are the tail and hydrophilic which is the head.