The right option is; B. straining
Straining method is the method that can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter.
Straining method is the use of physical method such as granular filtration media, usually combined with chemical method to remove undesirable substances from a liquid mixture such as water. The straining method is very flexible, and can be used to treat water inflows for industrial, municipal or residential purposes.