The correct option is
C Mitochondria from which outer membrane is stripped off
Mitochondria is a large cell organelle of eukaryotic cells. It is covered by a double membrane envelope. Mitoplast term is used to denote inner membrane and matrix of mitochondria as formed during subfractionation, when the outer membrane is dissolved with the help of detergent digitonin.
So, the correct answer is 'Mitochondria from which outer membrane is stripped off'.