St Lawrence river, why might it be important to trade?

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.

Judasim,christianity,islamic

The answer would be a.

If i were to guess i would say a