Microorganisms : Friend and Foe

Paheli dug two pits, A and B, in her garden. In pit A, she put a
polyhtene bag packed with some agricultural waste. In pit B, she
dumped the same kind of waste but without packing it in a
polythene bag. She, then covered both the pits with soil. What
did she observe after a month?
(a) Waste in pit A degraded faster than that in pit B.
(b) Waste in pit B degraded faster than that in pit A
.(c) Waste in both pits degraded almost equally.
(d) Waste in both pits did not degrade at all.