If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

If the depletion of oxygen is found to be 2.5 mg/litre after incubati

1.	If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
A.	50 mg/l
B.	100 mg/l
C.	150 mg/l
D.	250 mg/l
Answer» E.