Correct choice is (a) Aerobic composting
Easy explanation: Aerobic composting is usually used to treat the solid wastes which are generally dry in nature and not moist or wet wastes, whereas, anaerobic composting is used to degrade moist solid wastes which are very easy to degrade, and anaerobic digestion and Anaerobic composting is the same thing, and it is carried out under controlled temperature and high moisture control conditions, which takes place inside the vessel, a closed vessel.