Answer: d. He tried to use X-rays to see if there was an easier way to locate the foramen ovale.
Step-by-step explanation:
This relates to the book about Ben Carson, the famous neurosurgeon. Ben Carson was watching one of his instructors have a hard time trying to find the foramen ovale during a surgery and so he decided to come up with a better way.
He first tried to use X-rays to see if he could locate the foramen ovale easier and eventually settled on a technique that involved the use of two tiny metal rings. This method was subsequently accepted by the head professor of the program.