Three medical students (X,Y,and Z)studying for their physiology final examination develop headaches.Student X takes a regular aspirin with a glass of water; Y takes an enteric-coated aspirin with a glass of water; and Z takes an enteric-coated aspirin with a glass of milk (an enteric coating is one that dissolves only when the pH is above 6).Assuming that headache relief is proportional to plasma aspirin concentrations and that X_t,Y_t,and Z_t are the times until relief is experienced by the respective students,which of the following best represents the relationship between X_t,Y_t,and Z_t?