To connect the East Coast with the West Coast by rail required the railroads to overcome many obstacles. Which of these was the greatest obstacle to a transcontinental rail line?

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

the correct answer is option d

the economy will face inflation

where is the picture?