Icebergs in the Barents Sea are usually small, if the height of the above-water part

Icebergs in the Barents Sea are usually small, if the height of the above-water part of the iceberg is 10 meters, then the height of its underwater part will be?

According to hydro- and radar data, near the icebergs of the Barents Sea, the ratio of the surface to the underwater part is 1: 4. This means that with the height of the above-water part equal to 10 meters, the depth of the underwater part, called the draft, will be 40 meters, then the correct answer is option “B”: 40-50 meters.