The worldwide practice of Hinduism encompasses a wide variety of beliefs. However, a prevailing belief that is shared by most, if not all, Hindus is the importance of physical and spiritual cleanliness and well-being to attain purity and avoid pollution.
Holy places are usually located on the banks of rivers, coasts, seashores and mountains. Sites of convergence between land and two, or even better three, rivers, carry special significance and are especially sacred.
Hence, option A is correct.