The correct answer is B. Decreasing moisture content.
Seasoning is the process of drying timber to a safe moisture content for use. It is done to prevent the timber from rotting, warping, and splitting. The moisture content of timber is the amount of water that is present in the wood. The ideal moisture content for timber is between 12% and 15%.
There are two main methods of seasoning timber: air seasoning and kiln seasoning. Air seasoning is the traditional method of seasoning timber. It involves stacking the timber in a dry, well-ventilated area and allowing it to dry naturally. Kiln seasoning is a more modern method of seasoning timber. It involves drying the timber in a kiln, which is a large oven that uses heat and forced air to dry the wood.
Seasoning timber is an important process that helps to ensure the longevity of the wood. It is a necessary step in the preparation of timber for use in construction, furniture making, and other woodworking projects.
Option A is incorrect because increasing the moisture content of timber can lead to problems such as rotting, warping, and splitting.
Option C is incorrect because increasing the strength of timber is not the primary purpose of seasoning timber.
Option D is incorrect because all of the above are reasons why timber is seasoned.