It's D. A monopoly means that there is one company controlling the product.
I think it is B. <span>obedience to those of higher rank</span>
<h2> B.Rome was built on seven hills, which offered natural protection from invaders.</h2>
Because they did not evacuate their offices, which were in the direct path of the hurricane. ~ APEX
They did it because they were being lied to about how there was no war happening and also they wanted piece because it was like the era of hippies, the people also wanted Vietnam to fight its own wars
---hope it helps