Answer:(C) the amount of some good or service a producer is willing to supply at each price.
(B) the amount of some good or service a producer is willing to supply at a single price.
Explanation: Supply is a term in Economist used t refer to the amount of a good or service which a producer is willing to give out at a specific price or some set of prices.
Supply is affected by price according to the law of Supply.
At Specific price a producer might be willing to supply a given Product or service,or in a case where different materials are involved the producer might be willing to give a single price for all the items listed.