Scientists at the National Oceanic and Atmospheric Administration Oceanographic Data Center's analysis of 5.1 million ocean measurements performed around the world from the 1950s to the 1990s pointed out that most of the heat was absorbed by the oceans during global warming. Over the past 40 years, the temperature of the seawater has increased by an average of 0.31 degrees Celsius within 300 meters below the surface, and the water temperature has increased by an average of 0.06 degrees Celsius within 3000 meters. What is the correct summary of the information provided in the short article? ['American scientists have done a lot of long-term measurement and analysis of the ocean.', 'U. S. scientists find Earth is warming through long-term measurement analysis.', 'US scientists point out that most of the heat is absorbed by the oceans during global warming.', 'U. S. scientists use large amounts of data to prove rising sea temperatures.']