The price of grass seed produced by scientists is high, but the fact that it grows to a certain length as well as the elimination of lawn mowing raises interest and demand. For high prices, quality grass seed is obtained, where suppliers are invigorating by increasing supply where demand is higher, as well as where it is necessary to attract customers by cutting prices and seed bags, and listening to the needs of the claimant, talking about customized supplies according to the needs of consumers.
The answer is: D.