The sewage and sludge contains an average NPK content of

(A) 2.0 to 3.0% N. 1.0% P2 O3 and 1.0% K2 O

(B) 2.0 to 4.0% N. 2.0% P2 O3 and 1.0% K2 O

(C) 3.0 to 6.0% N. 2.0% P2 O3 and 1.0% K2 O

(D) 3.0 to 6.0% N. 2.0% P2 O3 and 2.0% K2 O

(E) None of these