A cylindrical tank with a vertical axis is 0.6 m in diameter. The oil level falls 20 cm in 17 days. Calculate the quantity of oil used per day in litres.
A. 1.662 litres/day
B. 2.236 litres/day
C. 3.325 litres/day
D. 3.318 litres/day
E. 16.632 litres/day
Answer: C