Answer:
Hi again lol the answer is "B. an agreement to work together"
B - rading about the remains of an ancient statue.
While both A and C are very romantic, both would take ages for a professional working archaeologist to dig up anything useful in a reasonable amount of time. The most effective thing that he can do is read primary sources and based on those decide where a temple stood.
"A. Fertile plains make it possible for farmers to grow a variety of crops." Italy's ability to grow a variety of crops aided in Rome's power over the world for many years, by providing lots of nutrients for its citizens and items to trade.
