Which of the following has the greater mass? 7.4 kilograms 7.4 decigrams 7.4 centigrams or 7.4 hectograms?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?