What is the primary function of V-type ATPases in lysosomes?

• A. They synthesize ATP within lysosomes to provide energy for cellular processes.
• B. They transport sodium ions out of lysosomes to maintain osmotic balance.
• C. They transport anions into lysosomes to neutralize the acidic environment.
• D. They pump hydrogen ions into lysosomes, acidifying the interior to facilitate enzymatic activity.

Answer: (D)