WHAT IS THE SERIOUS PROBLEM OF LAKE BAIKAL IN RUSSIA

29: What is the serious problem of Lake Baikal in Russia?A. It has 1,300 rare species that do not exist anywhere else in the world.B. It is one of the largest lakes that contains a variety of animals and plants.C. It is polluted by massive volumes of industrial wastes discharged into it.D. It is the only lake in Russia whose source of water is not drinkable.