Final answer:
The word 'Chester' comes from the Latin word 'castra' which means 'Camp'. Option D is correct.
Step-by-step explanation:
The Latin word "castra" is a noun that means "camp" or "fortification." It is the root of the English word "castle."
In ancient Rome, "castra" was used to refer to military camps or fortifications where Roman legions would set up temporary or permanent structures for their activities. The term is plural, and the singular form is "castrum." The word "castra" is also related to the modern English word "camp" in the military sense.