Question 2306 Deck General

The correct answer is D) improve their stability. Barges and vessels are ballasted before departure to improve their stability. Ballasting helps to lower the center of gravity of the vessel, which increases its righting moment and overall stability. This is important for safely operating the vessel, especially in rough seas or during cargo loading/unloading operations. The other options are incorrect because they do not accurately describe the primary purpose of ballasting. Option A is related to tank cleaning, not stability. Option B addresses free surface effects, which is a separate stability consideration. Option C is about avoiding pollution, which is an environmental concern rather than a stability issue.