The correct option is
B Intracellular digestion
Inside a cell, numerous organelles function to remove wastes. One of the key organelles involved in digestion and waste removal is Lysosome because they are filled with hydrolytic enzymes. These are also involved in the removal of worn-out organelles. For this reason, they are called the suicide bags of the cell.
Hence, the correct answer is 'intracellular digestion'.