Various methods of artificial seasoning are as follows:

(i)  Boiling: In this method of artificial seasoning, timber is immersed in water and water is then boiled. But it affects the elasticity and strength of wood.

(ii)  Chemical seasoning : This is also known as salt seasoning. In this method, timber is immersed in a solution of suitable salt. It is then taken out and seasoned in the ordinary way the interior surface of timber dries in advance of exterior surface of timber dries in advance and chances of formation of external cracks are reduced.

(iii)  Electrical seasoning: In this method, use is made of high frequency alternating currents. This is the most rapid method of seasoning. Initial and maintenance costs are so high that it becomes uneconomical to season timber on commercial basis by this method.

(iv)  Kiln seasoning: In this method, drying of timber is carried out inside an airtight chamber or oven. Air which is fully saturated with moisture and which is heated to a temperature of about 35°C to 38°C is then forced inside the chamber by suitable arrangements

(v)  Water seasoning: Timber piece are immersed wholly in water, preferably in running water of a stream. Care should be taken to see that timber is not partly immersed. The thicker or larger end of timber is kept pointing on the upstream side timber is taken out after a period of about 2 to 4 weeks.

            During this period, Sap contained in timber gets washed away by water.

Hence, the correct option is (C).