The correct answer is option 3, lysosomes. Lysosomes are membrane-bound organelles found in animal cells. They contain digestive enzymes that help break down various substances, including proteins, lipids, and carbohydrates. These enzymes are involved in the process of intracellular digestion, where they break down unwanted or worn-out cellular components, foreign particles, and ingested material that needs to be digested.

Option 1, mitochondria, is incorrect. Mitochondria are responsible for producing energy in the form of ATP, and they do not contain digestive enzymes.

Option 2, vacuoles, is also incorrect. Vacuoles are storage organelles found in plant cells, and while they may contain a variety of substances, they do not primarily house digestive enzymes.

Option 4, ribosomes, is incorrect as well. Ribosomes are involved in protein synthesis and do not contain digestive enzymes.

Overall, the correct organelle that houses digestive enzymes is the lysosome, making option 3 the correct answer.