The mixture of sand and water is separated by the process of
both (B) and (C)
The explanation for the correct option - (D) both (B) and (C).
The mixture of sand and water is first allowed to settle down by the process of sedimentation and then clear water is decanted from the bottom layer of sediment.
(B) Sedimentation – the process of settling down of insoluble component of a mixture at the bottom of a liquid is called sublimation.
(C) Decantation – the process of pouring off the liquid layer formed above the sediment layer without disturbing the bottom sediment layer. This method can also be used to separate two immiscible layers of liquids.
The explanation for the incorrect options-
(A) Sieving – The method by which the components of a mixture can be separated from each other based on differences in their sizes with the help of a sieve is called sieving.
For example – fine wheat flour can be separated from coarse flour with a sieve.
Hence, option (D) is correct. The mixture of sand and water is separated by the process of sedimentation and decantation.