Final answer:
The revision that corrects the sentence fragment by providing a subject and a predicate is 'The archaeologists determined that the ruined city had been built thousands of years ago.'
Step-by-step explanation:
When revising a sentence fragment to correct the structure and complete the thought, you must ensure it has a subject and a predicate. Considering the example 'determined that the ruined city had been built thousands of years ago', the fragment lacks a subject who performs the action. The answer to the question of which revision corrects this sentence fragment is c) The archaeologists determined that the ruined city had been built thousands of years ago. This revised sentence provides both a subject ('The archaeologists') and a verb ('determined'), thus making it a complete sentence.
Understanding how we learn about the past often involves looking at the evidence archaeologists and historians gather from monuments, artifacts, and ruins, such as those from Pompeii and other ancient civilizations. These remains provide invaluable insights into the lives and ingenuities of ancient peoples who created them, giving clues about the society, culture, and technology of those times.