Answer:
D. Price
Step-by-step explanation:
Price is the amount that is paid by the buyer to the seller in the purchase of the product. And it also deals in exchange for a product which we called barter. The more or less amount while exchange the product is also known as price
It is a measure of an item.
According to the given situation, the most appropriate option is d. as it says that the seller is willing to accept in a given time and in given circumstances that means he is ready for negotiation.