To estimate the amount of sunlight that can reach 10 meters of water depth using the graph, you would typically look at the point on the graph that corresponds to 10 meters depth and see what percentage of sunlight is indicated there.
Since I cannot see the image, I cannot provide the exact percentage for 10 meters. However, based on the typical options and if you have the graph in front of you, you should check the point at the 10-meter mark and see which of the provided responses (54%, 62.5%, 5%, or 58%) matches the graph.
If you're familiar with how the graph behaves, you might estimate a value before checking the exact point, but without the visual, it's difficult to give a definitive answer. Please refer to the graph and choose the option that aligns with the 10-meter depth indicator.