Take a look at this quote from Johnson’s pardon.
What was the only condition for Southerners to meet in order to receive a pardon?

they spoke with the president

explanation:

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

the answer to this question is the third option. hope this