Which of the following statements reects a perfectly inelastic demand when a new sales tax of $5 ' per unit is introduced into the market? A) "I had to lower my supply prices by $2 in order to avoid losing too many customers.\" B) "I had to lower my supply prices by $5 in order to avoid losing all of my customers." C) "I did not change my supply prices, and my customers paid the full $5 ." D} "I raised my supply prices by $6 in order to earn more money. " 21