All of the following were problems for "early railroads" except: a. Train robbers
b. Sinners.
c. Fraud people
d. None of these

answer:

the pacific theater was mostly an american-japanese conflict other than the land war in china. it was dominated by sea-borne warfare whether ship-to-ship battles, amphibious operations, submarine patrols, or attack from aircraft carriers.

the european theater had many combatants and was largely a land- and air battle ground. germany and the soviet union fought almost a separate war on the eastern front, across a huge landscape involving millions of soldiers, and great numbers of armored vehicles,