The correct answer is option 1, which is 1 part. When an iceberg floats in the sea, only a small portion of it is visible above the surface of the water. This phenomenon is due to the principle of buoyancy. The density of ice is less than that of water, so the iceberg displaces a volume of water equal to its own weight. Since only about 1/10th of the iceberg`s mass is above the surface, we can conclude that only 1 part out of 10 will remain visible. The majority of the iceberg`s mass is hidden below the water, contributing to its stability and ability to float.