Answer:
The correct answer is letter "D": standing-room-only.
Explanation:
Standing-room-only is a sales closing technique by which the clerk creates scarcity of a product to hurry the buyer to purchase the good otherwise there might not be samples available if the buyer decides to wait to make a decision.
By making the product "limited", clerks make buyers place special attention on that product even if it does not deserve it since the seller might be manipulating the information at will. Buyers must try to confirm if what the seller is true or if the clerks are just trying to push the sale.