The price elasticity of supply is determined by the flexibility of producers/sellers to change the amount of the good or service they produce in response to price changes. The flexibility of producers depends on two important factors. These factors are the availability of inputs to producers and the time horizon. The higher the availability of inputs for production, the higher the elasticity of supply. For example, the supply of beachfront property in Istanbul Bosporus or Mediterranean coasts is harder to vary and thus less elastic than the supply of new cars or computers. Supply is more elastic in the long-run than in the short-run. Over the short-run, the firms cannot easily change their plant size or factory size to change their production in response to price changes. The correct answer is B.