The correct answer is A.it brought in great wealth from conquered territories
assuming efficiency of each man to dig trench, in one day, for one hour is constant,

so one man, working for one hour in one day can dig 1.5 m
so 8 men, working 3 hours a day and will take, say $d$ number of days and efficiency will be constant. so,
$\frac32=\frac{220}{8\times3\times d}$
$\implies d=\frac{55}9=6.12$
Answer:
Support president Truman's decision to bomb nagasaki cause many people died due to this and the effect is very last long. Also this one bomb in nagasaki caused illnesses for the next 60 years also which led on and continued to make people in bad health.
Also just add some evidence about the amount of deaths. The air pultion levels.