On the 24th of the twelfth lunar month, the Chinese families give their homes a thorough cleaning, which is called the custom of （）.

On the 24th of the twelfth lunar month, the Chinese families give their homes a thorough cleaning, which is called the custom of （）.
A.cleaning ceilings
B.cleaning kitchens
C.cleaning dust
D.cleaning yards
正确答案：cleaning dust