The answer to your beloved question that you have asked this wondrous people is the Overland trail.<span />
All these countries have a common is that these all are located on Mediterranean sea.
Mediterranean Sea is a sea of Atlantic ocean <span>on the west to Asia on the east and separates Europe from Africa, it is almost completely enclosed by the land and during ancient time, it was an important route and it was allowed for trade, for traders and travelers.</span>
The best answer is C. physician's pledge to care for patients.
Hippocrates was a Greek practitioner of medicine, known by many today as the "Father of Modern Medicine" and established the Hippocratic oath which is still used today and required doctors to uphold ethics when caring for their patients. His philosophy of medicine, which includes the idea of doing no harm to a patient is a foundation for western medicine today.
I’m pretty sure it’s unskilled immigrants :))