The correct answer is (a) Lake Baikal.
Lake Baikal is the oldest and deepest lake in the world. It is located in Siberia, Russia. It is 636 kilometers (395 mi) long and 80 kilometers (50 mi) wide. The average depth of Lake Baikal is 744.4 meters (2,442 ft), and the maximum depth is 1,642 meters (5,387 ft). Lake Baikal is home to over 1,700 species of plants and animals, many of which are found nowhere else in the world.
Lake Huron is the second largest lake in North America, after Lake Superior. It is located between the provinces of Ontario and Michigan in Canada and the United States. Lake Huron is 596 kilometers (370 mi) long and 220 kilometers (137 mi) wide. The average depth of Lake Huron is 62 meters (203 ft), and the maximum depth is 230 meters (754 ft). Lake Huron is home to over 1,000 species of plants and animals.
Lake Victoria is the largest lake in Africa. It is located between Tanzania, Kenya, and Uganda. Lake Victoria is 69,485 square kilometers (26,828 sq mi) in area. The average depth of Lake Victoria is 40 meters (131 ft), and the maximum depth is 84 meters (276 ft). Lake Victoria is home to over 500 species of fish, including the Nile perch, which is the largest freshwater fish in the world.
Lake Winnipeg is the largest lake in Manitoba, Canada. It is located in the central part of the province. Lake Winnipeg is 416 kilometers (258 mi) long and 190 kilometers (118 mi) wide. The average depth of Lake Winnipeg is 12 meters (39 ft), and the maximum depth is 61 meters (200 ft). Lake Winnipeg is home to over 100 species of fish.