The deepest lake in the world is [C] Baikal. Located in Siberia, Russia, Lake Baikal plunges to depths of over 1,600 meters, making it the deepest among the options provided. Lake Titicaca [A] is the highest navigable lake, Lake Victoria [B] is the largest by surface area, and the Dead Sea [D] is a hypersaline lake with significant depth but not as deep as Lake Baikal. Baikal’s remarkable depth contributes to its status as the world’s deepest lake, holding a significant portion of the Earth’s freshwater reserves.