Question: U-Rolanda utshala izitshalo zikatamatisi engadini yakhe. Udale inqwaba yomquba futhi ubelokhu enezela umquba eduze kwezitshalo zakhe zikatamatisi ukuze asize ukuzivundisa. Umquba udoti oqinile lapho i-organic material ihlukaniswa ngama-microorganisms lapho kukhona umoya-mpilo lapho ingagcinwa khona ngokuphepha, iphathwe futhi ifakwe endaweni ezungezile. Yini u-Rolanda athembele kuyo ngokuyinhloko ukuze kusebenze umquba?
Options:
abakhiqizi
umshwabadeli
imithuthambi
iziboli
Answer: D