Answer:
Option D.
Step-by-step explanation:
Baron Von Steuben is the right answer.
During March 1778, America or the Continental Army was in the Revolutionary War for three years. At Valley Forge, the Continental Army suffered punishing wintertime. However, this was the time when Baron Friedrich Wilhelm von Steuben, an ex-army officer from Persia came on the scene to revive the confidence of the Continental Army. He introduces training and punishes the tattered veterans into a struggling state.
i believe correct me if i am wrong but am very sure it is Baron Von Steuben.
Good luck :D ;p