Mark the statement if it is a reason that rome was a good site for a city.

a.
rome was located on a large river.

b.
rome was built on seven hills, which offered natural protection from invaders.

c.
rome had an ideal seaport.

d.
the climate of rome was good for growing a variety of crops.

Rome was one of the richest and protected cities, and I can see there two correct options. I bet one than more is acceptable, so B.
Rome was built on seven hills, which offered natural protection from invaders. and D.
The climate of Rome was good for growing a variety of crops. are the truthful reasons why this city has a good site.

The correct answer is:   [b]:   "physical systems" .

The bottom part thats where most farming goes on