Tp+ burnt-out forest condo swimming dºm pool soin ps original slope septic tank sandstone septic tank well quartz sandstone river arkose sandstone swelling and shrinking clay mudstone city water line

Well, a and b together would be negative. b alone would also be negative.

Answer(say);

D. coal i hope that

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.