The correct answer to this open question is the following.
Although there are no options attached, we can answer the following.
I was sent to travel with Washington as I was familiar with the area, having been there when I worked for the Ohio Company." Who am I?
The answer is Christopher Gist.
Christopher Gist(1706-1759) was an explorer and pioneer of the Ohio country. So it is correct that he knew very well the Ohio territory and was of much help to George Washington. He had been exploring many regions of what today are parts of West Virginia, Pennsylvania, Indiana, and Ohio.
He became an important assistant of George Washington, acted as his guide in those difficult territories during the French and English War, and historians said that Gist was at the right time and place to save Washington's life two times in those expeditions.