Unlike other careers in neurology, all doctors of neurology who want to apply for work in the US must first go through certification.
licensing.
training.
a background check.

The correct answer is B. Licensing.

Explanation

The Neurologist is a doctor who has specialized in the study of diseases and disorders that affect the nervous system. When a person in the United States wishes to practice as a neurologist, they must follow some steps. You must first prepare to enter medical school by studying an area related to medicine such as chemistry, physics, biology, among others, which conceptually prepares you for the next step. In the second step, you must apply to medical school, where you will be put to the test with the Medical College Admission Test (MCAT) to measure your knowledge on this subject. Once you enter medical school, there you will learn for two years everything related to the necessary concepts and theory about medicine and later you will have to serve as a medical apprentice in university hospitals where you will apply what you learned.

Third, once the doctor has obtained his title that accredits him as a doctor, he must obtain one of the medical licenses that USMLE (United States Medical Licensing Examination) or COMLEX (Comprehensive Osteopathic Medical Licensing Examination of the United States ) doctors must have in the United States. Finally, the doctor must serve for three years as a resident in a hospital focused on an area related to Neurology and one more year of internship. According to the above, the correct answer is B. Licensing.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"