Final answer:
The b) Apatosaurus is the notable exception to dinosaurs having high estimated blood pressures. Long-necked dinosaurs had to pump blood higher than other dinosaurs, but an enormous heart and high blood pressure like giraffes is unlikely. Other mechanisms like slowing metabolism may have helped reduce the blood pressure.
Step-by-step explanation:
The notable exception to dinosaurs having relatively high estimated blood pressures is the Apatosaurus. Long-necked dinosaurs, such as the sauropods, had to pump blood up to ten meters above the heart, which would have required a blood pressure of more than 600 mm Hg. However, evidence for an enormous heart does not exist, and mechanisms such as the slowing of metabolism were likely in place to reduce the blood pressure required.