Yours blanks will be filled as followed,
1st Blank - Hannibal
2nd Blank - army
3rd Blank - war
4th Blank - Alps
The correct answer is B. was. Dollars are considered a singular unit here in the U.S. and thus follow the was/is rule.
He gives a fair chance to his humans because he provides them with a hunting knife, training and reliable clothes while zaroff his his"little tiny gun"