The correct option is B Sponging type
The housefly is the typical sponging insect. The labium forms a proboscis which is used to channel liquid food to the oesophagus. The housefly is able to eat solid food by secreting saliva and dabbing it over the food item. As the saliva dissolves the food, the solution is then drawn up into the mouth as a liquid.
Therefore, the correct answer is option B.