The correct option is C Dung
Female houseflies favour damp, dark surfaces such as compost, manure and other decomposing organic material such as dung for laying of their eggs. The eggs resemble individual grains of rice. Within a day, eggs hatch into larvae which are known as maggots. Maggots are legless, white insects that feed on the egg-laying site for three to five days. So, the correct answer is option C.