The correct option is C ₹ 25,000
Amount given by Ganesh is ₹20,000 and ₹13,000.
Amount returned to Ganesh from his sister is ₹8,000.
Final amount money given Ganesh = Amount given - Amount returned
= ₹20,000 + ₹13,000 - ₹8,000
= ₹33,000 - ₹8,000
= ₹25,000
Therefore, finally Ganesh gave ₹25,000 to his sister.