Match column I with column II and select the correct answer from the given codes.
Column I | Column II | ||
A, | Methanogens | (i) | BOD |
B. | Fermentors | (ii) | Methane rich fuel gas |
C. | Organic waste in water | (iii) | Production of methane |
D. | Biogas | (iv) | Large vessels for growing microbes |