What is the name of the place where the river empties into a larger body of water?

The place where the river water empties into another body of water is known as "the mouth"

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.

Ithink its b but i'm not sure.