Final answer:
In 'Hills like White Elephants,' the man suggests that the procedure is simple and common, trying to reassure the girl by downplaying its seriousness.
Step-by-step explanation:
In Hills like White Elephants, the man claims about the procedure that it is simple and common. He insists it is merely them 'letting the air in,' suggesting that it is not complex or dangerous. This is meant to reassure the girl and minimize the gravity of the abortion that is being alluded to. This aligns with option B) He insists it is a simple and common medical process.