c) Oregon

Oregon is home to Crater Lake, the deepest lake in the United States, formed by a collapsed volcano. Crater Lake is located in Crater Lake National Park and is known for its deep blue color and water clarity. Formed about 7,700 years ago by the collapse of the volcano Mount Mazama, Crater Lake is the ninth-deepest lake in the world, with a depth of 1,943 feet. The lake is a popular destination for visitors who come to marvel at its natural beauty and the dramatic landscape of the surrounding caldera.